Do We Have This One?
A character has just moved into a small room the size of a closet. For added hilarity, it may even *be* an actual closet. This person barely has room to stand up in, so what's the first thing that happens? They get visitors. Lots and lots of visitors.
Originally done by the Marx Brothers
in A Night at the Opera
, which features a tiny stateroom on a ship. All other versions of this gag are most likely an homage to the original.