The most recent entry on this list comes from Season 12, and sees the gang spending the day at a water park. A relatively simple premise that, like all good Sunny episodes, descends into crude, vulgar, chaotic scenarios that bring out the best comedy from the cast of exceptionally awful characters.
With Mac and Sweet Dee trapped inside a waterslide with a group of children, Frank and Charlie pretending Frank has AIDS to cut in front of all the lines, and Dennis tutoring a young con artist, this episode crams a lot of gags in to its three scenarios and perfectly portrays all five of the key characters in this single episode.
As things escalate and eventually collide in the episode's final act, it's hard not to laugh until it hurts at the screams of the horrified children, and the disinterest of the lifeguards at such an explosion of terror. With stand-out cameos from Game of Thrones show-runners David Benioff and D.B. Weiss as the two most unfazed lifeguards of all time, this episode is a perfect example of Sunny's humour, and how preserved their comedy has been over its 12 season run.