First you set up the camera, inside and outside of the bathroom, bedroom, anywhere like that.
Then you take maybe 20 piles of fresh dog poo, horse poo, cow poo, pig poo, whatever you could use in a bucket, fill that bucket up with anything that wont knock out the odor of the shit, heat it up . Not to long tho because that smell needs to still be there, but heat it up. Stir the poo until nice and runny and smells like death, hang over a door or someone like johnny could hold it. And the person that walks through that door, the poo either falls all them, or gets thrown in there face. And at the end of the prank, that person is covered in whatever poo you choose, and smells really fucking bad
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