Bart's prank calls occur when Bart Simpson makes a prank phone call to somebody. Usually, it's Moe, but occasionally others are involved as well.

Moe is the frequent target of Bart's prank phone calls. Usually, Bart calls Moe's Tavern and asks for an individual by his or her name. Unbeknownst to Moe, the name is a pun or double entendre, which Bart usually hides by saying the last name first when he tells Moe who he's calling for. The joke is revealed when Moe calls the person's name aloud, saying their first name (or initials) first, and the last name last, where his customers proceed to laugh at his expense. Curiously, Moe has heard Bart's voice several times and has yet not been able to identify the voice when it calls him. That said, Bart has been known to alter his voice, or it could be phone static. In addition, Moe once implied that the sender of the calls often changed his name. Sometimes Bart plays the pranks by methods other than over the phone, but the general idea is the same. While this was a running gag in earlier seasons of the show, the gag became less common and would only appear on some occasions.