"During this season, Moe pulled off one of his best-known pranks. On May 27, in the second inning of a game against his former teammates in Kansas City, Drabowsky called the Athletics bullpen, imitated KC manager Alvin Dark, and ordered that Lew Krausse begin warming up. A few minutes later, Drabowsky called again and ordered Krausse to sit down again. Finally, on the third call, Drabowsky’s voice was recognized."
https://sabr.org/bioproj/person/moe-drabowsky/