Sheldon S03e09 H264 Link | Young

: Despite his reluctance, Sheldon eventually agrees to attend Billy's party but sets his own rigid boundaries. His "participation" includes only mouthing the words to "Happy Birthday" instead of singing and limiting himself to exactly one slice of cake.

In an attempt to correct the error—specifically trying to glue a tail onto the creature in a more anatomically correct position—Sheldon suffers a mishap. He slips, falls, and dislocates his shoulder. young sheldon s03e09 h264