It's not going to break the fan, bouncing a rubber ball off the wall isn't going to dent it, and the roof can hold me just fine.  You LIED!

"Fans", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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It's not going to break the fan, bouncing a rubber ball off the wall isn't going to dent it, and the roof can hold me just fine. You LIED!