Al Kelly was the stage name of Abraham Kalish (18 Dec 1896 – 7 Sep 1966), a vaudeville comedian who was known for his double-talk and went on to stooge for other comedians such as Willie Howard and Ernie Kovacs. He started in an act called Nine Crazy Kids, then started performing comic monologues. When he was performing this stand-up comedy in the 1930s, he fluffed a joke so that it came out as nonsense. This got a good laugh so he made such double-talk the focus of his act and became especially known for this. Kelly died of a heart attack while sitting in the audience in the dining room at one of his favorite venues, The Friars' Club, during a roast.

Source: Wikipedia