It's Always Sunny in Philadelphia (2005)

S12E2 The Gang Goes to a Water Park

Title: The Gang Hits the Water Park Plot: The gang decides to spend a day at a nearby water park. Dennis mentors a young aspiring thrill-seeker. Meanwhile, Frank and Charlie set out on a mission to conquer every attraction in the park. Meanwhile, Mac and Dee find themselves trapped in a tangled situation inside a tube slide, leading to unexpected chaos.