2. Exhibitionists (Arnold's Thanksgiving, S3, E14)
There are two pretty damning examples of exhibitionism in the show. The first is pretty blatant, when Grandma goes to a nudist beach in the special episode Summer Love (Season 4), quoting "when in Rome", then subsequently scaring away the rest of the public. The second example is slightly less obscure. Think more Disney's The Rescuers' famous naked lady scene. You've got to be quick to spot it, but during one episode, Helga and Arnold leave the house and you can clearly see a couple getting freaky in the window for about 3 seconds. Now there's no nudity, so it could easily be explained as something harmless, but if you can work out what harmless activity these two are getting up to over the dinner table then please explain. For now, let's just put it down to someone enjoying their Thanksgiving dinner a little too much and having extra desert.