I couldn't decide whether this was a game or just something funny, but then I realized that it was more funny than anything else so here we go. I'm going to start on number 1, and the next poster should put number 2, and so on and so forth. And if you have personal experience with any of these tell us about them. So here we go....
1. Take someone's shopping cart and switch the items with stuff from the person next to them's cart.