As per the note that these Calvin stickers are not ‘exactly’ what the true Calvin looked like in the cartoon, I’d have to say that it falls under the legal rulings for parodies. That is, if you modify an existing work enough, it can become an original work in and of itself. I’d actually think the more likely person to sue would be the owner of the corporate logo being pissed upon (Chevy, Ford, etc.) since that is definitely a trademarked symbol being used without authorization. Of course, if they are considered ‘public figures’ from a legal standpoint, you may be able to do or say whatever you want about them without fear of a squadron of lawyers laying waste to your bank accounts providing you are not attacking them on something specific that is blatantly untrue (pissing doesn’t claim anything so it’s likely fair game)
Of course, all this ultimately gets decided by a court of law if the person does get sued, and I’m sure that rarely happens. They threaten, and the guy making the stickers in his basement just throws in the towel. I believe we had a thread recently from a guy who was doing a parody of ‘The Family Circus’ cartoon on his Web page, and he ultimately gave up when the lawyers of the cartoonist tracked him down.
Incidentally, living in San Diego, I always assumed these stickers were being made in Mexico and shipped across the border. That would virtually guarantee you’d never find the orginal person who made them…