The Oscar (1966)
Oh! Please do "The Oscar: - it's FINALLY coming out on disc in February. Worst Performance by a leading man (Stephen Boyd)! Worst - and only - Performance by a crooner way in over his talent (Tony Bennett)! Most embarrassing credit in an interesting career (Harlan Ellison)! And Milton Berle as Kappy Kapstetter (Milton Berle)! This is a Rifftrax must.
Based on the mads podcast about this movie, it sounds like perfect riff fodder. Sounds yummy!