Objects of the class “Foghorn Leghorn”: parodies that are more famous than the original. (“It would be as if everybody were familiar with Duchamp’s Mona-Lisa-with-a-moustache while never having heard of Leonardo’s version.”)
Objects of the class “Whoopi Goldberg”: actors who are undeniably talented but are almost always in bad movies, or at least movies that aren’t worthy of their talent. (The opposite: William Holden.)
Objects of the class “Weekend at Bernie’s”: low-quality movie, nobody’s actually seen it, but everybody knows what it’s about. (Other examples: Heathers and Zelig.)
I love these. We need some more.