I came up with this rather interesting game/thing to do while bored at an airport.
First, find someone standing far away from you, and try to get their attention. Once gained, try to instigate a visual memory game, by clapping, stomping, jumping, or doing any sort of movement you can think of, but without shouting to help them figure it out.
If all works out, the game will function like Simon, meaning that each person will create a new body movement or action and incorporate it in a chain of such actions. However, the entire object of the game is to get them to figure out what is going on, without telling them anything or letting them come close.

Interesting. Though be careful with your body language. Some people are fucking idiots who interpret certain gestures like death threats or something.

Had a situation like that myself one time.

... How would you go about doing that? They'd probably just think you're a crazy hobo and ignore you...

That seems to be the point of the game.

*looks at farty*

*clap clap stomp stomp jump jump*

Well... Stop drawing your finger across your throat.

Lol, yeah, you could totally get away with beating someone up in an airport...

Just pretend to be a member of the CIA

Rantent, I've tried similar things involving interacting with people, it generally seems to fail, but sometimes the results are hilarious. It sounds like if this worked out you could have an interesting story to tell. Did you ever actually get it to work?

Just do random stuff to laugh at people.
E.G.
Get 3 friends in an airport/mall whatever, and get them to gather in a mostly clear area [E.G. centre of food court].
Get them all to stare upwards, no moving, just keep staring.

Watch the reactions of passers by.
????
Profit.

Not entirely yet, I have yet to see anyone figure out it was a memory game, but I did get someone to mimic movements. They seemed rather goofy.

Next time it happens it'll probably be two SENers in the same airport both trying to trick eachother to play the same game...

Ah, i get it. If you see someone totally random, and you clap, they'll clap back, because they don't know what is going on. They might give you a weird look while doing it, but more then likely they'll do it. If you clap and do another action, then they'll do the same thing, and more then likely catch on