Arrow to the knee is kind of a joke that originated from a video game called Skyrim. The line from the game is "I used to be an adventurer like you...then I took an arrow to the knee". Many people like to use the phase "...arrow to the knee" at the end of a sentence to compare themselves to what the person can do, or what they are doing.
Man 1 I used to write like you... until I took an arrow to the knee.
Man 2 What?
Man 1 An arrow to the knee.
Man 2 Sorry to hear that.
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