50. While having a nice picnic in the backyard, say you have to go to the bathroom and walk back into your house. Then get comfortable in a chair in front of a window and then turn on the backyard sprinklers.

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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.
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50. While having a nice picnic in the backyard, say you have to go to the bathroom and walk back into your house. Then get comfortable in a chair in front of a window and then turn on the backyard sprinklers.