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Originally posted by Amethyst
This is to be done in the public restroom.
First, get a huge melon that's small enough to fit in the toilet.
Take the melon with you into the stall. Wait until you know someone's in another stall. Really grunt and pretend you're straining for a good while, then drop the melon in from as high as you can.
Then see if you can see the look on the other person's face.