Television stations in the US are required by FCC regulations to have a minimum of three hours a week of "educational programming" aimed at children. This actually began in the '90s, and initially television stations met the requirements by having little life lessons tacked on to their various cartoons. Some of you may recall very peppy "Sailor Moon Says!" segments, or "Knowing is half the battle!" from G.I. Joe. Other "edutainment" shows baked the lesson right into the text, such as Captain Planet and the Planeteers (pollution is bad, environment is good, go Captain Planet!) and Where on Earth is Carmen Sandiego? (geography and fighting crime!). More recently, FCC regulations have tightened up a bit, and shows need to do a bit more than say "Drugs are bad, m'kay?" to quality for an E/I rating, but we still have a good decade of important "educational" cartoon shows to look at and consider the life lessons we're to learn!
So, what can watching cartoons teach us about people who are crazy? Oh, lots of fun things!
In general throughout this series I've tried to stick to depictions of crazy ladies across various media types. However, cartoons in the '80s and '90s were gender segregated (girls get ponies, boys get robots!), and thus this list is very male-character dominated.
Show: Darkwing Duck
Summary: "I am the terror that flaps in the night!" A Disney send-up of various superhero tropes,
Darkwing Duck's titular character fought super-criminals while raising his adopted daughter and trying to juggle his other personal relationships. Darkwing fought crime and looked stylish doing it. The TV Tropes summary is pretty awesome.
Crazy character: Quackerjack. Quackerjack is described as an insane clown or a crazed toymaker. He cackles "insanely" before committing his various crimes, which he often does at the behest of his "talking" doll, Mr. BananaBrain. He apparently used to be completely sane, but then his company was driven out of business by the success of video games. ("Don't play video games, kids, they'll rot your brains.") He's violent and can't be trusted.
In the episode "Stressed to Kill," Quackerjack teams up with another crazy Supervillain (Megavolt) to disguise themselves as psychiatrists. As "Doctor Heebie" and "Doctor Jeebie" at the "Stressfree Clinic", they use parodies of pop culture therapy to prove that Darkwing is tense and just needs a jolt from their "Relaxotron" for help. This renders Darkwing unable to fight their crime spree.
See also: Megavolt (who wants his light bulbs to run free with their wild light bulb brethern) and NegaDuck (who is a violent "maniac" just for fun).
Summary: The Warner Brothers and Warner Sister, Dot. "Just for fun we run around the Warner Movie Lot! They lock us in the tower whenever we get caught! But we get loose and then vamoose and now you know the plot!"
Crazy character: Are Yakko, Wakko, and Dot supposed to be crazy? I keep waffling back and forth on this one. They're described as crazy and insane in some places in the show, and in other places just "zany." What I'm more interested in is their time with Dr. Otto Scratchansniff, who is supposed to make them less "zany" or crazy or whatever.
Dr. Scratchansniff is another example of a therapist parody. Like many of these fake therapist, he has a thick faux-German accent (Dr Heebie & Dr Jeebie do as well). With the Warner Siblings, we see him do faux ink-blot tests, talk therapy, word association, art therapy, and puppet therapy. Often the end of sketches comes when the Warner Siblings have made him "crazy".
Crazy tropes: Bad Therapy.
Summary: They're more than meets the eye! They're robots in disguise! The good Autobots fights the evil Decipticons.
Crazy character: Galvatron. He's the leader of the Decipticons, and has been driven insane by being stuck in a pool of plasma. (I personally think being tortured repeatedly by Unicron in the animated movie didn't help.) He's violent, he attacks his own side in battle, he refuses to make plans because plans are for the weak. He's the biggest liability for the Decipticons, but they can't get away from him because who knows what violence he'll unleash upon anyone who betrays him?
In the episode "Webworld," the Decipticons decide that something must be done and are tricked into sending Galvatron to the therapy planet Torkulon. Tuorkulon is your typical pop culture asylum, with the inmates kept in cages and repeating nonsense to themselves, "drugs" (in the form of electronic control) that keep the inmates from doing much of anything, inmates tied to their beds, talk therapy ("kill, smash, destroy, rend, mangle, distort"), art therapy, some sort of scream therapy, and a lobotomy. Ultimately Galvatron's madness infects the planet itself.
Movie: The Lion King
Summary: Hamlet as performed by Lions.
Crazy character: Ed the hyena. He laughs, and laughs and laughs and laughs and laughs. His eyes don't focus, he drools, he's violent, and crazy. Scary violent crazy Ed.
Crazy tropes: Crazy violent people.
In and of themselves, these shows are relatively harmless. I'm not concerned that kids will grow up thinking that gravity doesn't work if you don't look down, as in the old Roadrunner cartoons. However, in these shows we see a lot of the same tropes we see writ large in media aimed at adults. Quackerjack talks to dolls because he's crazy—just like Dru in Buffy. Crazy=violent, just like in Single White Female. Therapy is relatively useless, as it is in many other shows. Asylums are inherently violent and always depicted as frightening. Crazy people can't be reasoned with, they can only be dealt with.
As always, it's not each individual item on a list that matters. It's that each individual item is joined by every other individual item into presenting people with mental health conditions as inherently dangerous and violent, and therapy as inherently useless. It starts with cartoons aimed at children, and it just goes up in age-group appropriate media from there.