Hello, folks. Long time reader, first time poster.
Thought I'd come out of lurking with a bang so to reciprocate on all the cool ideas I've gleaned from this forum over the past year, here is a stellar invention to help keep your dwarves entertained while they dine.
Somewhere in your dining room build a pressure plate which can be triggered by a dwarf. 10 z-levels above said dining room, carve out a room, make it a pasture, and fill it with the animal of your choice. (I prefer kittens).
A trapdoor linked to the pressure plate will open it when a dwarf passes over it. The channeled tube leads directly down from the "kitten holding chamber" to somewhere in the dining room.
I guess you can see where this is going. Dwarf hits the pressure plate which opens the trapdoor and if a kitten is standing on it, the kitten is dropped 10 z-levels into the dining room to the amusement of all present. Extra hilarity ensues if it lands on another dwarf.
On the downside your dining room is usually a mess, but on the bright side everyone can be outfitted nicely in kitten leather gloves.
This has surpassed in enjoyment my previous dining hall entertainment of a pit filled with war dogs whom goblin prisoners can be tossed into. I tried making a zombie pit to throw prisoners into but eventually the FPS gets bad and you can't exactly control the zombies very well. One door opened at the wrong time and you've got a problem.