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What are some great and harmless pranks for April Fools' Day?

Answer:
Switch your parents clothes with yours so when they try to put them on they're too tight. Also, stick a pound coin to the ground with superglue and see if anyone picks it up! ^^
Glue a penny on the ground in a noticeable area. When a little kid comes around to pick it up, he/she won't be able to! Then yell out, "APRIL FOOLS!!"
First answer by Bombasaur. Last edit by JCT815. Contributor trust: 20 [recommend contributor recommended]. Question popularity: 3 [recommend question].