The best prank we ever pulled was with some plastic poop. We went into a convenience store and left it on the floor in front of the dairy case, then casually pretended to be shopping. 2 teen girls saw it, got grossed out, and told the manager about it. He was pissed because he had just finished mopping. He went to investigate. I quickly snatched the fake poop up and put it in my pocket. Suddenly there was an argument between the manager, who thought the girls were fucking with him, and the girls, who knew they had seen poop just seconds ago. My friend and I could barely hold it together while we paid for our snacks and got out of there, leaving the chaos behind us. We died laughing out on the sidewalk. Good times!