555 Brian... but have to say that parody humor is like art- in th eye of the beholder. Many of the films you list are slapstick and that is just one sub-genre of comedy films. There's intellectual humor (think Woody Allen), dark humor (any of Tim Burton's stuff), over the top humor ("Knocked Up", "Superbad', "Grandma's Boy", "Pineapple Express", "Something About Mary", etc...), foreign humor (Brit Monty Python types, others from many lands), and direct parodies (like "Iron Sky" which is hard for people to follow if they don't get the jokes about German technology, disc aircraft, the Nazi regime, German weapons history, etc...). And that's just a few examples. I love all genres and sub-genres of film. It really depends on the individual and even the circumstances of the first viewing. If you go to a cramped theater with bad seating and viewing along with a rowdy crowd it can affect your perception of the movie and your viewing experience. And watching at home with dogs and kids in the way, screaming, fighting, other distractions can also alter perceptions. I try to watch movies in theaters first day if blockbuster and weeks later for average (the crowd in one affects the pleasure of the first while the absence in the others allows another kind of pleasure). Movies at home depend on who is over or what I'm dealing with at the time. And our views on what is funny changes like everything else over time. Some films like "Animal House" remain comedy classics, but others that were funny as a kid over decades are viewed as an adult as not so funny anymore. I used to love "1941" but now get annoyed by it as well as other Belushi films. SNL tv comedy was very funny back when but seems dull now. Things change... all always will. More people like Adult Swim material for example or view White Trash television shows as hilarious (from "Duck Dynasty" to "Here Comes Honey Boo Boo!!!").