It’s a simple one, and it’s just saucy enough that people feel a little excited over having been included, but not so saucy that you risk offending someone (your mileage may vary depending on your peer group, results not guaranteed). It requires just enough participation and interaction that people perk up and start talking to each other, but not so much that anyone has to get up or anything. If the conversation was flagging before, odds are that it’ll get a little more personal and a little more genuine afterwards.

It could also fail. I don’t know. I don’t go to very many parties. Give it a try anyhow.

The question is this: How would you give a handjob if your wrists disappeared?

That’s it. No further setup is necessary. People will want to ask you questions — does this mean my hands are locked onto my forearms like a Barbie doll? Are my hands flopping around like a puppet’s? Has that entire part of my arm disappeared, or just the joint? Can I move my fingers? But those are not for you to answer. They’re for each handjob-pantomimer to determine for themselves.

Also, the word “handjob” is inherently funny.

Actual sexual preference does not enter into it. In this world, your wrists have been removed from your body and it is deeply important that you perform a complete handjob on a nearby penis (there’s nothing remarkable about the penis in question; only your wrists have been altered).

Everyone interprets the situation differently. Everyone’s face becomes a mask of determined concentration. Everyone really brings the bulk of their spatial reasoning to bear, and it’s a delight to see. “I didn’t even think of doing it like that,” someone will declare. “That’s a really great strategy.” And you’ll all have learned something.