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You scream 'Earthquake Test!' at your buddy mid-stream and slam them into the urinal like they're a soggy bagel.
I yelled 'Earthquake Test!' at my buddy while he was peeing, and he ended up peeing on the wall.
My cousin was halfway done peeing when I yelled 'Earthquake Test!' and he face-planted into the toilet.
I screamed 'Earthquake Test!' at my brother and he spilled his entire pee all over the floor.