If laughter is contagious, LEO is immune.
LEO and Laughter
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Explanation
Experiment
Explain Bear
Listen up, chucklehead! This joke is so simple even a bear like me can understand it. Basically, LEO is a dude who can't laugh, because laughter is contagious and he's immune. Get it? It's funny because most people aren't immune to contagious diseases. You probably aren't because you look kinda sick to me.