 (episode #3.3), Joeys (Matt LeBlanc) arm is in a protective sling.  In real life, LeBlanc had dislocated his shoulder on set attempting  a sight gag. At the beginning of this episode, Chandler (Matthew  Perry) overhears Joey bouncing on his bed and falling off. This was  written into the story line to explain why the character would be  wearing a sling.