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I had my best friend pretend to be my Gyno (lady doctor, for those who don't know)..and had her call my house. When my mother picked up, she informed her that my pregnancy test had returned positive. Oh my gosh, the look on my mothers face was priceless. My mother told my friend to hold on, lowered the phone, and asked me slowly, "Are you pregnant?" And I responded with the best answer I couldn't help BUT say...

"Aw, shit. I hope not because I did like five lines of coke last night."

Lets say I never played a prank on my mom again. XD

EDIT//

Oh yes, one more. I put squishy ketchup packets underneith the toilet seat in the girls bathroom at my old highschool (this was like years ago). Haha, the girl who used that toilet went straight home.

That one took a lot of imagination.