I am probably a very bad man for this, but--
When I get the 'joy' of being exposed to a shrieker, I imagine them shrieking so hard, and so long that they start to sound like a chipmunk. Usually, such people end up shrieking like this because they themselves focus too much attention on problems, and run out of budgeted resources. (see the concept Truean hinted at above).
They need this petty thing they are trying to buy at less than list price, because it is the only way they can get it while still being in-budget for the grand hoodiedoo they have planned for their dear little Timmy's soccer game, because they decided that this was their week to host the event, and it needs to be more special than when the other parents hosted it, and blah blah blah.
They have focused their attention on every tiny minute detail of this grand master plan of theirs, that they have no attention span left to foresee or deal with problems that might pop up (because they arent nearly so good at planning as they think they are, because they planned their grand event without any fallback room-- again, this is because of the attention deficit they are suffering from micromanagement. They only see the prize they want, not the realities of the road to get there. Only the idealized one where everything happens perfectly.)
So, when (as it is inevitable) things go a little sideways, they are incapable of coping with it mentally, and go bananas.
I find this amusing. Very very amusing. The more they scream, throw things, demand to see the manager, and make a general ass of themselves, the more I smile and laugh my ass off inside.
Remember: It is impossible for a perfect fantasy to come to fruition, especially on a shoestring budget. People are imperfect, the results of hard work are imperfect. They compound to destroy any vision of a perfect event. The punch might be a little too sour-- the bunting is crooked-- there arent enough chocolates out because one of the boxes got mooshed in shipping-- whatever. Because they have all their energy tied up in this event, even the slightest flaw in presentation is seriously destructive to them, and it is all because they are desperately trying to seek outside reinforcement of their self worth. "I gave my daughter the BEST wedding party!", or "I am the greatest mom ever for pulling off this after game event!" or any other reason.
This ties in with the "YOU MUST SIGN UP PEOPLE ON OUR CREDIT CARDS OR ELSE!!" madness two posts up as well. A middle manager wants to show how they are the bestest middle manager ever, by increasing profits in an impossible manner, by pulling off an impossible stunt-- Never mind the harsh realities this causes, A-La Wells Fargo.
As truean rightly points out, these people are quite mad, and quite conceited. The "clothing" they insist is there, is the guarantee of success, and all the prestige and fame that goes with it. They bet everything on it happening, and then they micromanage to DEATH trying to make it happen, when the real world has this way of preventing the perfect outcome they require.
And, when it does not happen perfectly-- they dont have any mental resources left over to deal with that reality, and they literally explode in a hissy fit.
There are other jobs. They may not be glamorous, or even pay well, but there are other jobs out there. (As an example, last year I found myself in a situation where I was forced to quit a job suddenly. Employment prospects were bad for me that year, so I elected to look outside the box. There are certain vocations that are literally shitty (as in, literal shit is involved), but are always in demand, like healthcare. It costs 600$ for the vocational training and state certification to become a CNA, and there are never enough of those in the workforce. So, despite being a trained network admin, and CNC programmer as my primary vocation, I did exactly that. Last year I worked in a nursing home taking care of old people. They pay is terrible, but it is a bullwark against the mental horror of being fired from a better job. I can always go back to helping the elderly if push comes to shove. There *IS* work waiting for me. About 6 months ago I got a break, and am now doing CNC programming again as a contractor. Good times, but getting that CNA kept the lights on for a full year. Good investment.) Once free from that nagging self-doubt about how this person can harm you, you can smile, and ask most pleasantly if they would like to talk to your manager. It becomes like teasing a screaming kid that isn't yours, asking if they would like to tell their mommy all about it. This is even better when your manager is one of the "No clothes" types.
So, inwardly, when I see that type of crap happen, I smile. It fills me with sadistic pleasure to know that they are only hurting themselves by their bad time and resource management, and further, I know there is not a damn thing I can do for them except NOT cushion their fall when it all comes down around them. You cannot help somebody that wont help themselves, and placating their fantasies only makes them worse, not better. I actually help them the best I am able, by allowing life to demonstrate their foolishness for them.
Again, look at Wells Fargo-- They did the "8 is GREAT!" bullshit, where they did everything imaginable to pressure their staff to sign their patrons up for at least 8 financial services, when the industry average is 2 to 3. When this insane pressure to produce the impossible (you cannot influence market demand, by issuing ultimatums, no matter how important you think you are.) resulted in their workers engaging in illegal signups without customer approval, just to keep their jobs, it first caused people to attempt
whistle blowing, (which of course failed, because the emperor was SURE his new clothes were real), and then finally, the malfeasance was so apparent that federal regulators got involved, and issued
some very harsh penalties including
clawbacks of compensation for the CEO and community banking manager, who were driving the whole ordeal.
The reality, is that if Wells Fargo had simply FAILED to reach target goals, when it was only 4 or 5 services per customer, they would never have been involved in so much fraud, and this whole thing would not have blown up the way it did. Allowing their grand master-plan to fail, due to opposition with reality, is really the best way to help them. In fact, the sooner they fail, the better for everyone. In fact, if it fails before it can make any profit for them at all, the better as an educational aide it is. It will better encourage them to avoid that kind of thinking in the future.
Take comfort in the knowledge that there are ALWAYS options, even if they are unpleasant. Safe in that knowledge, see screaming patrons and demanding bosses for what they really are, and be quite happy to let them fail. Do your job the legal way, and dont encourage failure through sabotage-- but allow it to fail naturally. If they fire you, or they refuse to give you hours, seek alternatives to their employment, even if those alternatives are unpleasant.
Once you do, instead of the raging dragon in the corporate office, they turn into a screaming 2 year old demanding a diet of straight cookies and icecream.
It is very funny watching them give themselves a tummy ache.