Some people knock with a big bang, others prefer to ring the bell, but when Sheldon goes next door he likes to say knock knock for some strange reason.<
Penny once dated a musician, and when he heard Sheldon's strange way of knocking he just had to write a song about it!
He wrote Knockin on Penny's Door in a couple of days, but by the time the song came out Penny and the musician had broken up, and Sheldon was left wondering if his theory about that song being written about him was true!
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