Gene Hackman In Young Frankenstein (1974)
The renowned Gene Hackman's one scene in the classic movie, which follows hard-boiled roles in movies like The French Connection (1971) and The Conversation (1974), was made even more unforgettable by the opportunity to witness him alter modes. His interaction with Peter Boyle's Frankenstein monster as Harold, the Blind Man, is undoubtedly the funniest moment of his over 60-year career.
That whole scene with the girl in #29 made me wince. It was hard to watch, but then so was the whole movie.
This.