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Lisa's Laughatory is a Bart Simpson Comics story that appears in Bart Simpson #79.

Lisa wins the April Fool's Day contest in Springfield Elementary School with a simple whoopee cushion, which annoys Bart for her jokes did not make him laugh. Lisa decides then to learn how she can be more funny by doing pranks and she starts studying classic pranks. After several hours of studying, Lisa finds a prank that she wants to test out the next school day. At school, Lisa is going to throw a water balloon at Martin but she realizes that she does not want to do it and interrupts the pranks and runs away with the balloon. Bart chases Lisa when she is holding the water balloon and he is happy that she wants to prank with his school mates but Lisa says she just can not do it. Bart convinces Lisa then it is normal that she wants to play with Martin after he came first in the spelling bee, and she came second. And when Lisa asks him if it's okay to do these pranks with all that goes on her nerves, Bart responds that it's okay.