What do you say when a handicapped man forgets something? "He knew it like the back of his hand."
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Explanation
Explain Bear
Alright, listen up, smarty-pants! So, the joke is that this dude is handicapped, right? And the punchline is that he knows something "like the back of his hand", but because he's handicapped, it's funny because...well, you know! I can't believe I even have to explain this to you.