I went once with a friend to a club and he said that I really stand out of the crowd as a geek. I said: impossible, prove it. He took out his phone and recorded 30 seconds of me dancing. It took me watching just two seconds from this movie to realize he was right.

I don't frequent dance floors much since then. Still haven't got over it.

A variation is to try run as normally as you can. Be honest; no goofing about. Try to run as normally as anyone can. Then have someone watching you run (again, honestly) exactly as you just ran.

It's both hysterical and horrifying, because what you think of as normal is anything but. And it's true for everyone.