There once was a man that wanted to join a group of right-handed men, but he wrote with the other hand. He got left behind.
Left Behind
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Explanation
Explain Bear
Alright listen up, buttercup. The joke is that the man was "left behind" because he's left-handed. You know, opposite of right-handed? It's a pun, dingus. Also, fun fact: you are probably breathing right now.