The trio are lounging on the golf cart. "Dude, what are we going to do this weekend? Nothing's going on." Mordecai said. "I don't know." Rigby said. "Wow, what a great answer." (Y/n) said sarcastically, and Mordecai snickers. "Yeah, you got any better ideas?" Rigby asked. Silence... "That's what I thought." Rigby rolls his eyes, and so does (Y/n). The trio hear a golf cart coming towards them. Mordecai gasps. "Dude, it's Benson." He said. Mordecai and Rigby quickly gulp down the soda,
throw the cans away, and clean the cart, as Muscle Man drops off Pops and Benson. "Alright, so that's tonight. Don't forget it. And be sure to tell (Y/n)." Muscle Man said, reminding Benson. "We'll be there." Benson said. "See you there." Muscle Man drives away in the cart. "What was that all about?" Mordecai asked. "Yeah, tell you what?" Rigby asked the girl, who shrugs. "I don't know." She said.
Pops then approaches them. "Oh hey (Y/n)! Muscle Man just wanted us to inform you that you've been invited to his party." Pops said. "Oh, Mordecai and Rigby. What costumes are you going to wear?" He asked. "Costumes?" The trio asked. "Muscle Man's throwing a birthday party for Hi Five Ghost. Apparently, it's a costume birthday party." Benson said. "Let me see." Rigby said. "Ah, what? It's invite only." Mordecai said. "You guys got invited, right?" Benson asked the duo.
"We didn't even know there was a party. Did you know there was a party?" Mordecai asked. "No, I did not." Rigby said. "Me either, and apparently I was invited." (Y/n) said. "You were." Benson said. "We didn't even know there was a party." Mordecai repeated. "Oh, well..." Benson snatches the invitation. "Maybe you two weren't invited." He said. The trio stared at each other. Muscle Man puts a lot of cans of soda into an ice bucket. "Hey, Muscle Man. Uh... we heard that you're having a party tonight. What time should we show up?" Mordecai asked.
"NEVER, YOU'RE NOT INVITED!" Muscle Man then turns to see (Y/n). "But I'm looking forward to seeing you there, pretty lady." He said, and the duo growl slightly. "You're coming right?" He asked her hopefully. "Uh..." she looks at her best friends then back at him. "Of course! Wouldn't miss it." She said, and he smiles, and her best friends look at her in disbelief. "Alright!" He gets back into the golf cart. "See you there, pretty lady!" He drives off and the duo glare at her. "What?" She asked.
"What the hay, (Y/n), so you're still going to go even if we weren't invited? We're your best friends!" Rigby sounded kind of hurt. "Look, I'm sorry, but he did invite me, and... I'd feel bad if I didn't show up, you know? He's kind of a friend of mine too." (Y/n) said. Rigby sighs, then groans. "Fine." He crosses his arms angrily. "What's his problem? Why won't he invite us to his party?" Rigby asked Mordecai. "Dude. I know why he's not inviting us to the party." He replied. "Really?" (Y/n) raised an eyebrow. "Why?" Rigby asked. "Remember when you were choking this morning?"
~Flashback~
Rigby is choking loudly in the kitchen. Muscle Man laughs. "Look at Rigby's face." He said, and (Y/n) instantly panics. "Oh no, he's choking!" She walks over to Rigby. "Don't worry, dude. I gotcha." Muscle Man continues laughing until Rigby throws up his spit wad, which then gets in his soda and splashes in his face. "Aw, sick! Your choke wad spat soda in my face!" He whines hysterically.
~Present~
"Dude, that wasn't our fault, I was gonna die. And besides, we got him a new soda." Rigby said.
~Flashback~
Muscle Man is still whining about the soda on his face. "Ugh, quit whining. Here's another soda, you big baby." Rigby holds the glass of soda, but trips over the soda can, splashing more soda into Muscle Man's face. "Uh oh..." Muscle Man then goes into a ballistic frenzy, pushing the table against the wall, then whamming on it, and lying on the floor still whining.

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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...