Santa Claus Is a Stinker or Le Pre Nol est une ordure was a cult French comedy play created in 1979 by the troupe Le Splendid and turned into a film directed by JeanMarie Poir in 1982.
The buildings lift is malfunctioning, and they receive visits from unwanted callers Katia, a depressed transvestite who tries to hit on Pierre, M. Preskovic who lives in the same building and always turns up unexepectedly to offer them various unappetizing pastries and Josette, a heavily pregnant woman on the run from her violent fianc Flix. Flix is working as a Santa Claus during the season and turns up on her trail in costume and brandishing a gun. Flix and Josette, a caricature trailer trash couple, end up struggling over the gun and accidentally shooting dead the lift repairman, whom they then butcher and feed to zoo animals.
Source: Wikipedia