How did the tree get sick?
It got tinsel-itis.
Tinsel-itis
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Explanation
Explain Bear
Listen up, dummy! The joke is that the tree got "tinsel-itis," which sounds like tonsillitis. Tonsillitis is when your tonsils get infected. A tree doesn't have tonsils, but it can have tinsel, especially around Christmas. So, the joke is using a similar-sounding word to make a silly connection. Get it now, Einstein?