Old Jewish Man

The Old Jewish Man, (sometimes called the Crazy Guy or Crazy Old Man) is Grampa Simpson and Jasper Beardley's friend.

Nickname
Mayor Quimby once referred to him as "Old Jewish Man"; as well, a list of heart recipients listed him as "Old Jewish Man" ("Homer's Paternity Coot")

Voice
He speaks with a stereotypical Jewish accent, and curses in Yiddish in one episode.

Friends
He is apparently friendly with Krusty the Clown and Krusty's father, as the three of them have been seen walking along a street singing the ditty "Even though we're not gentile / We'll get together for a while" at Christmas.

Jobs
He often yells at people and is sometimes seen owning a Pep Boys-esque store (in the Halloween story "Attack of the 50-Foot Eyesores").

Television
He once had a brief period of stardom after his act of dancing on a street corner singing "The Old Gray Mare" with his pants down became a hit on television.

Film
In "Natural Born Kissers", he was revealed as having worked as a studio executive during the making of Casablanca, having hacked on a later suppressed happy ending, with a question mark that left the door open for a sequel, and the It's a Wonderful Life "killing spree ending". He observes that the quality of studio management has changed over the years. At the time of the Casablanca blunder, they "was just dopes in suits. Not like today!" He diplomatically left unstated whether the difference is that studio executives are more intelligent now, or that they no longer wear suits.