21. (WARNING: this could get you kicked out of the place) When your friend is in a public restroom, randomly turn the lights on and off creeply. Then whisper "...hash slinging slasher..." Then leave the lights off and go banging on every stall door screaming "I KNOW WHERE YOU LIVE!!!!!!".
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50 Ways to Annoy Your Friends
De TodoCompleted! This is a book of ways that you can annoy your friends with. It's all fun and games until they get revenge.