things to try at mcdonalds when you're bored:
1. if there's a really long line, say you only want to order a soda, move up to the front of the line, andorder a bunch of stuff
2. get a bunch of ketchup packets and spread them around on a table before you leave.
3. annoy other customers in any way possible
4. get one of those tiny hamburgers, mangle it up, and try to flush it down a toilet (you might need more than 1), and make sure the toilet over-flows. Then get an employee to clean it up.
all i can think of right now.