(Y/n), Mordecai and Rigby are laughing while watching a prank call video on the computer. Suddenly, a phone rings on the computer. "Hello." An old woman asked. "Oh, yes, this is I'm a sure." The voice on the other end spoke. "I'm a sure, who?" The old woman asked. "I'm a sure glad I ain't Joe Mama!" (Y/n), Mordecai and Rigby laugh at the prank call video.
"Oh, yeah! You just got pranked by the Master Prank Caller!" He said. "The Master Prank Caller is the funniest thing on the internet, right, dudes?" Rigby asked. "Ye-e-eyah, I guess he's pretty funny." (Y/n) said. "But you know what's even funnier than watching prank phone calls?" Mordecai examines the telephone. "Hmm, hmm, hmm!" The trio said. InIn Pops' room, he's ironing his pants when the telephone rings. "Hello?" He asked. "Hello, Pops?" Rigby asked.
"Yes?" (Y/n), Mordecai and Rigby start snickering. "Please hold for a collect call from... JOE MAMA!!!" (Y/n), Mordecai & Rigby laugh, and call Skips, who is seen lifting weights. "Hello?" He asked. "Hey, Skips, do you have a son named "Joe Mama"?" Rigby asked. "Excuse me?" Skips asked. (Y/n), Mordecai and Rigby laugh again. Skips hangs up with an angry look. At Benson's apartment, he is sitting in his easy chair when the phone rings. "Hello?" He asked. "Hey, Benson, you got any books by "Joe Mama"?" Mordecai asked. "Who is this?"
(Y/n), Mordecai and Rigby laugh even louder than before. Mordecai releases the phone, still listening to Benson. "Wherever this is coming from, I will track you down and I will find you, and if it...!" Benson said. "Oh, dude, he's still on the phone!" Mordecai said. "HE'S STILL ON THE PHONE?!?!?!" Rigby asked. "HE'S STILL ON THE PHONE! HA, HA, HA, HA!!!" (Y/n), (Y/n), Mordecai and Rigby laugh so hard that Mordecai hangs up. Rigby's eyes start to water. "O-O-O-h! Oh, Mordecai, we're the best prank callers ever, aren't we?" He asked. "Yeah, second best." (Y/n) said. "What? Uh. Did you not hear what we just did? We were hilarious!" Rigby said. "Yeah, we were. But we're not number one until we do this."
Mordecai picks up a phone book and begins flipping through the pages. "Who are you calling?" (Y/n) asked. Mordecai ceases shifting through the pages and points to a specific number on the book. "The Master Prank Caller." He replied. Mordecai grabs the phone. "Holy crap." Rigby said. As Mordecai is about to dial, Benson bursts through the door. "HANG UP THAT PHONE! You think your little pranks are funny, huh? You think they're funny? Well, what do you guys think of my prank?" Benson walks towards the phone, and pretends to think he's being called by someone.
"Ring, ring. Hello, what's that? Mordecai and Rigby are banned from using the house phone? Okay." Benson's face turns red. He pulls the phone from the wall and shatters it on the floor. "GOOD LUCK MAKING YOUR PRANK CALLS NOW!" Benson throws the phone's remains down and slams the door on his way out. "Dude, let's go use Pops' phone." In Pops' room, he's still on the phone, and the iron is still on his pants, which are smoking. "Pops, can we borrow your phone?" Mordecai and Rigby asked. "Oh, I would, but I'm holding to talk with Joe Mama." (Y/n) snickers. 'Oh god, he took that literally.' She thought. A pulse is heard from the phone. "But you're welcome to use the phones under my bed." He said. (Y/n), Mordecai and Rigby walk towards Pops' bed.
"Aw, cool! What kind are they?" Mordecai asked. Rigby pulls a case from under Pops' bed and opens it to reveal eight 1980s brick-sized phones. "Aw, '80s cellphones!" Rigby said. "Sick." (Y/n) said in agreement. "Cool. Thanks, Pops." Mordecai said. "Oh, and guys... do be careful. I think they might cause brain tumors." Pops turns back to the phone and then his head starts to throb. (Y/n), Mordecai and Rigby exchange knowing glances.
Later at the park, Mordecai, Rigby, and (Y/n) wrap foil around their heads. "Alright. Now let's prank the Master Prank Caller." Rigby said. "Okay, here I go." Mordecai dials the phone and the telephone rings. The Master Prank Caller picks up to answer. "Hello?" The Master Prank Caller asked. "Yeah, this is, uh, pizza delivery guy? I have 50 pizzas here that you ordered." (Y/n), Mordecai and Rigby snicker. "Sounds great. Bring 'em over." He said. "Uh, you ordered 50 pizzas?" Mordecai asked.

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Regular Show X Reader
FanfictionThree best friends, a blue jay named Mordecai, a brown raccoon named Rigby, and a chipmunk named (Y/n) work as groundskeepers at a park, spending their days trying to entertain themselves (occasionally by perfecting useless skills during work hours...