Riddle: a ping pong ball is stuck in a tube. The only supplies you have to get it out is a bucket of water, a pair of tongs, and a sponge. The tube is too small to fit your hands in, and too small to open the tongs in. How could you get the ping pong ball out given these conditions?
Answer: pour some water down the tube, the ping pong ball will float to the top.
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