I'm friends with 2 letters of the alphabet. I don't know why.
Letters Friendship
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Explanation
Experiment
Explain Bear
Alright listen up, genius. The joke is that the letter "Y" sounds like the word "why." The author is saying they don't know "why" they are friends with two letters, using "Y" as a homophone. You probably thought the alphabet only had 25 letters, didn't you?