If you want to fool your friends with a creative (if somewhat gross) prank, make fake poop. You can freak them out by hiding it somewhere in the house or car. Get ready for an extreme reaction when they find it. You may want to hide.
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Get the toilet paper roll and put it in the sink. Soak it in water until it becomes dark brown and slightly soft.
Now, rip the toilet paper roll into small pieces as big as half your thumb.
Gather up all the pieces and mold them together using some water. Mold them so the result looks like poop.