Tf2 is a gold mine when it comes to taunts, some of them:
Soldier:
If god had wanted to to live, he would not have created me!
This is my world, you are not welcome in my world.
We have your surrounded, atleast from this side.
You are all weak, you are all bleeders.
If you know whats good for you, you will run!
I am going to claw my way down your throat and tear out your very soul!
You are a spineless worm! You are a mistake of nature! You are walking vomit!
You will not be missed!
Engineer:
Take it like a man, shorty.
Im gonna beat you like a rented mule boy!
Start praying boy!
Im gonna lay you out!
Scout:
Im gonna beat your skull until I hit tonsils!
Yeah, come get some, you freaking wuss!
What are you looking at!?
Demoman:
Dont fret boyo, Ill be gentle.
Im gonna kill you and Ill keep killing you and I never, cause you be dead and then Im gonna kill you!
Im gonna stick me thumbs down yer eyes and hang on til yer dead!
Ohh, Im gonna beat you so hard, youll have a twitch!
Youre making me very cross!
Oh, they are going to find you all dead in the alley with cats licking at ya.
Im gonna strangle you with me bare hands!
Heavy:
Oh, run, run, Im coming for you!
Who send all these babies to fight!
You cannot hide, coward!
I promise you pain without end!
You cannot beat me!
Your luck runs out.
Do you think you can beat me!
I think you should fight someone much, much smaller!
All of you are babies!
Sniper:
The funeral aint gonna be open casket!
Im gonna plant one right between the eyes, ya panzer!
Keep jubbing that big mouth, while its still attached to your bloody neck!
You shouldnt have even gotten out of bed!
Fighting mens might not be your thing lad!
If your strategy is to build me confidence, its working.
Its only gonna get worse, mate.
Now I gotta make a necklace out of yer teeth, bushmans rules.
I reckon your gonna get real used to looking up at me!
Ive slept in the corpse of a water buffalo thougher than you!
Go to hell, wanka!
Heres a touching story. Once you died and I lived happily ever after. End of story.
This is going to be a real piece of piss, you bloody fruit shop owner!
Im gonna turn ya into colored rain!
That helmet is gonna be a nice bowl for your brains!
Spy:
You are going to die for your honor -and my amusement!
You are an amateur and a fool!
I also like some of the new vegas terrifying presence comments, can only remember one atm though:
I will wear your head as a hat.
Happened to me once in masterwork I think.