Years ago my younger brother and I thought we'd cheer my sick mother up with a little skit. My brother would pretend to have his finger stuck in his ear and then, after various contortions, when he finally removed it I would pull the bathroom plunger from the wall and provide a loud POP. We rehearsed it in the bathroom several times and it all went well. Then we went to hallway by my mother's room and played it for her in the doorway. At last my moment for sound effects came and I pulled the plunger away from the wall. To my horror no loud POP sounded but instead a large section of plaster crumbled to the floor. My mother laughed and suggested I cover the spot with a poster until we repainted.