Milt Moss, a comic actor who delivered the rueful catchphrase “I can’t believe I ate that whole thing” in a memorable commercial for Alka-Seltzer in 1972, died on Sept. 26 in Manhattan. He was 93.

His nephew Roger Fox announced the death last Wednesday.

Mr. Moss was a nightclub comedian and master of ceremonies in the tradition of Henny Youngman. His comedy was based around well-trodden one-liners, bits and impersonations.

He opened for performers like the singer Robert Goulet and appeared on television with Milton Berle, Merv Griffin and Johnny Carson. He was also known as a master of the put-on, convincing unwitting audiences at official events that he was a legitimate speaker, like a chief executive or an ambassador, and then slowly veering from the reasonable into the absurd before revealing that he was a comedian.