Sniff your friend’s socks – while they're still wearing them.
Wait for someone to come out of their house and hit them with a pillow.
Wear diapers (real or made from toilet paper) for two days.
For half an hour, stand on the road and pretend as if you're talking to someone when you actually aren't.
Put on someone’s bra and go outside dressed this way.
Go outside and tell the first person you see that you like/love/hate them.