Saw another before it actually aired called "The Advice." It's more of the show's dark comedy, but not quite with a subversive message or surreal humor of most other ones. It does have the oft tread message that teachers become teachers because they want to inspire students, but eventually get beaten down by reality of misbehaving, ungrateful brats, and low pay (which is mentioned before, but not here- it's subtext). Especially with Mr. Small, who laments about how much he wanted to inspire children. He then gives Darwin and Gumball advice they take too literally, and once again they wind up destroying things every time they try to fix them.