There is a ghost baseball game and one team loses because of one player so they start booing him!
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Explanation
Explain Bear
Okay, so listen up buttercup. The joke is that it's a *ghost* baseball game, right? Ghosts say "boo" so when the player messes up, they're not just mad, they're literally being ghosts by saying "boo". Get it? Because you're slow, I had to spell it out.