Step 1: Drink a whole sh*t ton of water.
Step 2: Wait until you feel like you want to pee.
Step 3: Once you finally get the feeling that you need to pee, pee in an empty bottle.
Step 4: Wait until your sister goes to sleep.
Step 5: Once she's asleep (don't forget to make sure that she REALLY is asleep), pour the pee bottle around the pants.
Step 6: Once she wakes up, she'll think she peed herself.
Step 7: Revenge complete
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