[Oatka]

Bart Simpson is the prime suspect:

Moe, at Bart's suggestion, asks his clientele: "I'm looking for 'Amanda Hughankiss' ", with the expected results.

[SERKIT]

Moe: (answering the phone) Flaming Moe’s.
Bart: Uh, yes, I’m looking for a friend of mine. Last name Jass. First name Hugh.
Moe: Uh, hold on, I’ll check. (calling) Hugh Jass! Somebody check the men’s room for a Hugh Jass!
Man: Uh, I’m Hugh Jass.
Moe: Telephone. (hands over the receiver)
Hugh: Hello, this is Hugh Jass.
Bart: (surprised) Uh, hi.
Hugh: Who’s this?
Bart: Bart Simpson.
Hugh: Well, what can I do for you, Bart?
Bart: Uh, look, I’ll level with you, Mister. This is a crank call that sort of backfired, and I’d like to bail out right now.
Hugh: All right. Better luck next time. (hangs up) What a nice young man.