I think Bogdanovich's "What's Up Doc?" does end with Bugs Bunny and Elmer Fudd singing the title; but the phrase first shows up somewhat early in the film, then several times more near the ending.
― Hongro Hongro Hippies (Myonga Vön Bontee), Monday, 15 May 2023 17:42 (eleven months ago) link
Sweetie, You Won't Believe It
Assuming the translation is accurate. Fun movie, anyway.
― Cherish, Monday, 15 May 2023 19:59 (eleven months ago) link