This episode's type of humor may cause some to roll their eyes, but there's a lot of fantastic writing and acting in here. The writers give Jake Hopkins the most ridiculous things to say (and sing), and he gives an 11/10 performance. The first time I saw this, I was dying at the entirety of the second act. I showed it to my brother and we were both struggling to breathe as Gumball repeatedly tries and fails to get Tobias to slap his butt.
It took me several watches to realize that Tobias is whistling the same tune that Gumball was singing about his butt. Just another brilliant joke that the writers threw in.