 The screech of the black cat who is thrown by Bialystock into the  theater and voice the Stormtrooper who sings, "Dont be stupid, be a  shmartie, come on join the Nazi Party" in the song "Springtime for  Hitler" are provided by Mel Brooks (I) (qv), two roles he also  prerecorded for the Broadway show and one (the Stormtrooper) that he  did in the original movie. Its also a line from the 1983 single "To  Be Or Not To Be 