It's anything but.
Two bored groundskeepers, Mordecai (a six-foot-tall blue jay) and Rigby (a hyperactive raccoon) are best friends who spend their days trying to entertain themselves by any means necessary, much to the displeasure of their boss. Their everyday pursuits often lead to things spiraling out of control and into the surreal.

Pilot (Episode 1) 9.5
Air date: 2010-05-09
Runtime: 8 min
Overview: Mordecai and Rigby have started their new job, and are pretty pleased with their lodgings. The only cloud on the horizon is the fact they have no furniture. Luckily, Pops is throwing out a chair he doesn't find comfortable, so the two decide to settle ownership with a game of Rock Paper Scissors.

Ringtoneers (Episode 2) 10.0
Air date: 2011-04-15
Runtime: 3 min
Overview: Mordecai and Rigby ride a needy space worm.

Party Tonight - Regular Show 1 Million Fan Exclusive (Episode 3) 10.0
Air date: 2012-03-10
Runtime: 11 min
Overview: OOOOOOOHHHHHHH!!! Regular Show's creator JG Quintel and Cartoon Network love all 1 Million of you so much, we had Mordecai, Rigby, and the rest of the park guys make this Party Tonight music video that's so awesome, it can only be described with three letters: R-A-D. You can only see it here, so thanks for being a Regular Show fan!!

Party Tonight - TV Version (Episode 4) 10.0
Air date: 2012-04-17
Runtime: 11 min
Overview: A live action music video by the Regular Show Gang served as a "thank you" for 1 million Facebook likes. This short made its first appearance on Cartoon Network on April 17, 2012.

The Naive Man from Lolliland (Episode 5) 10.0
Air date: 2005-01-01
Runtime: 4 min
Overview: Quintel's 1st student film, "The Naive Man from Lolliland" tells the story of a foreign ambassador who visits the United States only to learn that his customs are unwelcome. Features an early inspiration for Pops.

2 in the AM PM (Episode 6) 10.0
Air date: 2006-01-01
Runtime: 7 min
Overview: Quintel's 2nd student film, "2 in the AM PM" tells the story of two slackers, who are left alone to run a convenience store on Halloween night, where candy filled with drugs creates a mini-nightmare. Features early inspirations for Mordecai and Benson.

Episode 7 (Episode 7) 10.0
Runtime: 11 min

Four Things You Didn't Know About J.G. (Episode 8) 10.0
Air date: 2014-06-17
Runtime: 4 min
Overview: Included as a special feature on the Season 3 DVD

J.G. Answers Why (Episode 9) 10.0
Air date: 2014-06-17
Runtime: 8 min
Overview: Included as a special feature on the Season 3 DVD

Characters Come to Life: Live Episode Read (Episode 10) 10.0
Air date: 2014-06-17
Runtime: 8 min
Overview: Included as a special feature on the Season 3 DVD

USA! USA! (Episode 11)
Writer: Owen Dennis
Air date: 2015-07-06
Runtime: 3 min
Overview: To show their knowledge of other countries to Benson, Mordecai and Rigby rap about every country they know about.

Fun Run (Episode 12)
Writer: Sarah Oleksyk
Air date: 2015-09-01
Runtime: 5 min
Overview: Pops goes on a fun run across the country.

OOOHH!!! (Episode 13)
Writer: Ryan Pequin
Air date: 2015-10-01
Runtime: 2 min
Overview: Mordecai and Rigby tour the world doing their "OOOHH!!!" celebration.

Break Time (Episode 14)
Writer: Madeline Queripel
Air date: 2015-10-08
Runtime: 2 min
Overview: Mordecai, Rigby, Muscle Man, and Hi-Five Ghost ask Benson for a break.

Ninja Shoes (Episode 15)
Writer: Madeline Queripel
Air date: 2016-03-26
Runtime: 3 min
Overview: Mordecai and Rigby try to sneak out of the house wearing ninja shoes.

Coming Soon (Episode 16)
Writer: Toby Jones
Air date: 2016-04-02
Runtime: 3 min
Overview: Mordecai and Rigby mimic the movie trailer voices.

Sick Day (Episode 17)
Writer: Owen Dennis
Air date: 2016-04-09
Runtime: 3 min
Overview: Mordecai and Rigby decide to slide into a sick day.

Pizza Pouch Drop (Episode 18)
Writer: Owen Dennis
Air date: 2016-04-16
Runtime: 3 min
Overview: Mordecai and Rigby strive to make the ultimate pizza pouch.

The 1973 Tetherball Championship Trophy (Episode 19)
Writer: Toby Jones
Air date: 2016-04-23
Runtime: 3 min
Overview: In a spoof of Wes Anderson films, Mordecai and Rigby try to win a vintage tetherball championship trophy.

2001: A Nap Odyssey (Episode 20)
Writer: Ryan Pequin
Air date: 2016-09-23
Runtime: 2 min
Overview: The guys take a nap in zero gravity.

Time Loop (Episode 21)
Air date: 2016-12-19
Runtime: 2 min
Overview: The guys get stuck in a time loop.

Synth Buttons (Episode 22)
Writer: Owen Dennis
Air date: 2016-12-23
Runtime: 2 min
Overview: Mordecai and Rigby realize that the bridge of the ship is also a synthesizer.

Robot Rap Battle (Episode 23)
Air date: 2016-12-26
Runtime: 2 min
Overview: Mordecai and Rigby participate in the 10th Annual Robot Rap Battle.

Space Worm (Episode 24)
Air date: 2017-01-02
Runtime: 2 min
Overview: Mordecai and Rigby ride a needy space worm.