When my friend is in a bad mood I will always sing this no matter where we are, why? this song has helped me understand that my friend and I are exactly like Plankton and Spongebob at times, so even in the library or outside in the rain, I will sing this and she eventually gives in and sings along, it usually helps for fights when we argue. People who learn from this song most likely learn that even the grumpiest people can be happy but -spoilers for the episode start here- Even though Plankton did turn evil again at the end of the episode -end of spoilers- they did show signs of friendship that we as a society should learn, and why shouldn't we? oh wait because this show is for 'kids' LIES!! yes it is aimed for the child audience BUT it doesn't mean we can't sit down with our sibling/relative/etc. and watch some cartoons you grew up with! I still watch cartoons even though everyone in middle school is all like: "lame" "stop being such a child" or stuff like that, but if I have a bad day first thing in my head F.U.N song and find my friends.