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You poop in someone’s toilet and don’t flush it while they’re gone and let it stink up the place until they come back
I took a dump in my cousin’s toilet and left it to fester like a boil until she got back.
I made a Grunny in my mom’s bathroom and it stank like a dead raccoon in a trash can.
I shit in my neighbor’s toilet and left it to rot because I hate him.