Bart's prank calls

Bart's prank calls occur when Bart Simpson makes a prank phone call to someone. Occasionally other people 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 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. Curiously, Moe has heard Bart's voice several times and has of 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.

Sometimes Bart plays the pranks by methods other than over the phone, but the general idea is the same.

Aftermath
When Moe realizes that it's actually a prank, he gets mad and gives the caller threats like: On one occasion, Bart played a phone prank from his house, and right after Moe realized the call was a prank, Marge happened to pick up the phone and got an earful of Moe's threat. Bewildered by the harsh language that came over the phone as soon as she picked up the handset, Marge concluded that it must have been a crossed line.
 * "It's you, isn't it, you cowardly little runt. When I get a hold of you, I'm gonna gut you like a fish and drink your blood!"
 * "I'll shove a sausage down your throat and stick starving dogs in your butt!"
 * "Listen to me, you, when I catch you, I'm gonna pull out your eyes and shove 'em down your pants so you can watch me kick the crap out of you, okay?! Then I'm gonna use your tongue to paint my boat!"
 * "When I get a hold of you, I'm gonna use your head for a bucket and paint my house with your brains!"
 * "Listen to me, you little scum sucking pus bucket! When I get my hands on you, I'm gonna pull out your eyeballs with a cork screw!"
 * "You rotten little punk! If I ever get a hold of you, I'll sink my teeth into your cheek and rip your face off!"
 * "Why you... I'm gonna chop you into little pieces and make you into a Rubik’s Cube which I would never solve!"

Sometimes, Bart passes the phone to someone when Moe realizes that he has been tricked and they get an earful of Moe's threat. This happened in "Principal Charming".

Homer attempted to phone-prank Moe and it backfired, due to Moe repeating the name ("Eura Snotball") back to Homer. Homer, in typical fashion, interpreted it as an insult and threatened Moe: "If I find out who this is, I'll staple a flag on your butt, and mail you to Iran!"

Another time when Bart had just finished a prank call, Marge told him to go to Moe's and pick up Homer. Moe didn't recognize Bart as the phone prankster, but he did think that Bart's voice sounded familiar.

Bart once managed to take advantage of Moe's constant threats to ruin Jimbo's date with Laura, by addressing himself as Jimbo Jones and giving the Simpson Address after making the prank call. Moe easily fell for it, thinking that the kid fessed up, and then took out a knife (which was rusted and dull, which was perfect for him, implying that he only intended to scare the prank caller and not actually hurt/kill the prank caller), and then arrived at the Simpson residence easily scaring Jimbo and causing Laura to break up with him.

The Swedish barkeep, after learning that Bart prank called him, said in an ominous tone, "Wait a minute... If I ever get a hold of you... I will thank you for showing me the futility of human endeavor."

When Marge was a teenager, she called Moe asking for Elvis Jagger Abdul-Jabaar, the name Homer used to laugh at. Moe turned to the camera and said, "And that's the origin of that." His aftermath was "I will rip out your intestines and use them to make a lanyard!"

It was also implied that Moe unknowingly threatened Fat Tony after he called for a Yuri Nator, a person he was legitimately trying to contact (Yuri Nator was the name of a Russian business partner of Fat Tony's).