"Naked Gun 33 1/3: The Final Insult" (1994)
The envelope with the name of the best picture winner contains a bomb, and Leslie Nielsen's Frank Drebin - masquerading as Phil Donahue! - is on the case. He crashes the chorus line of a Pia Zadora production number, tackles Raquel Welch, and reverse peristalts into a tuba. Imagine what he might have done if Barbara Walters had interviewed him beforehand.
Pictured: Leslie Nielsen (left) and Raquel Welch.