At the park lakeside, people are sailing, chilling, etc. (Y/n), Mordecai, Rigby and Pops are sitting around a table with a sandwich and some ingredients. "Hoagie Sandwich! Hoagie Sandwich!" The quartet said. "Squeeze out the Mustard, do it real quick!" Mordecai puts on mustard. "A dab of Mayo, too much'd be sick!" Rigby puts mayonnaise on. "Healthy veggies'll make this valid!" Pops puts on lettuce and tomatoes. "And don't forget the main ingredients so we don't confuse it with a salad!" (Y/n) said.
"Meat! Meat! Meat! Meat! Meat! Meat! Meat!" The four said as they put meat on. Mordecai elbows in onto the table and holds it up as everybody in the gang laughs. A group of four fully grown Canadian Geese show up on the bridge. The Geese start attacking the lakeside, starting by scaring a couple away, pushing a squirrel off the bridge, and even dropping a giant rock on a paddle boat with a couple in it, breaking it and sending the couple into the lake. Two of the geese chest pound each other. "Those ruffians!!" Pops gets up and runs to the geese. "Now see here, geese!! Your behavior is most uncouth! Now, I'm afraid- " the geese start pushing him around. "Ahhhh!" Pops runs away, sobbing.
"Why you!" (Y/n) said angrily. She was about to attack them when they start attacking her first. "Ah!" "(Y/N)!" The duo shouted. "Hey, quit it!" Rigby snapped. "Stop!" Mordecai shouted. (Y/n) was about to cry just as the duo pull her away from the aggressive birds. "Are you okay?" Rigby asked her worriedly as she holds in her tears. "I'm... I'm fine..." she said. "Don't you dare touch her again you monsters!" Rigby shouted furiously. The geese stare at the sandwich and Rigby realizes it. "PROTECT THE SANDWICH!" The geese attack it and throw it in the trash can before attacking the trio and they quickly run away. "WHYYY?" Rigby asked, sobbing now as well.
The geese start punching the trash can, smashing it in the process, and rolls the trash can towards the three where it may have hit another trash can, sending some garbage flying in the air. Later the trio are in Benson's office. "Benson, something's gotta be done about those geese. Pops is locked in his room crying!" Mordecai said. "Not to mention they hurt (Y/n)! And that is crossing the line!" Rigby shouted angrily.
"Yeah, we gotta get some kind of payback for that." Mordecai crosses his arms, and Benson gazes at (Y/n) and notices her messy state from the attack and frowns slightly. "Yeah, we've been getting complaints. They're highly territorial, war-like birds." Benson lays back his feet on the desk. "Luckily, I got a couple of guys who will be taking care of the problem." He said. "Dude, awesome!" Mordecai and Rigby said. "Who is it?" Rigby asked. "A couple of guys named Mordecai and Rigby." Benson said. "What?!" The duo asked. "Wait, by themselves? Shouldn't I help?" (Y/n) asked. "No, (Y/n). I don't want those geese attacking you again. You should stay out of this." Benson said.
The duo were in shock from this and look at each other for a second, then over at (Y/n) for a second. "Maybe you don't understand, Benson. These geese... they're terrifying." Mordecai said. "Terrifying!" Rigby shouted. "I don't wanna hear it! Do it or you're fired!!" Benson shouted. "Man, you always say that. You're all talk, Benson." Rigby said. Benson starts seething in anger. "I don't think you should have said that." (Y/n) said.
"GRRRRAAAAAAAAAAAAAUUUURRRRGGGGHHHH!!!!" Benson gets up in a rage. "URAAAAAAAAAAAHHH!!!" (Y/n), Mordecai & Rigby scream, and Benson chases (Y/n), Mordecai & Rigby out. The trio are now back at the lakeside. "All right, dude, you ready?" Rigby nods with a blanket in his hand, and Mordecai takes out another blanket. "You stay here (Y/n)." Mordecai said. "But-" "stay!" Mordecai shouted.
"Please just listen to us, (Y/n). We don't want you getting hurt." Rigby frowns, and so does (Y/n). "Okay..." she said. "Here goes nothing." Mordecai and Rigby wave their blankets at the geese, screaming. "It's working!" Rigby said. The geese snatch their blankets away. Two of them turn them into whips and start to whip the duo and (Y/n) cringes, and seeing this infuriated her. Next the duo try something else. "Ready?" Rigby asked. "Ready!" Rigby stares at the geese, attempted to get the hose but the geese in front of him picks it up with its beak and sprays the geese repellent on Rigby. "Hey quit it!" Mordecai gets sprayed at. "Uh! Smells like rotten eggs!" He shouted. The other geese come along. Some fly over to where (Y/n) was hiding and start to attack her. "Ah!" The duo quickly turn around to see. "HEY STOP!" Rigby shouted.

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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...