The 25 greatest spoof movies of all time

There may not be a more wholly satisfying type of movie comedy than the spoof. It's a crude form of satire (take a serious, successful thing and mercilessly poke fun at it), but when practiced by sharp-witted writers and filmmakers, it is an unbeatable entertainment bargain (typically clocking in under ninety minutes) that appeals to viewers of all ages. The subgenre took off in the 1970s and '80s thanks to Mel Brooks and the ZAZ team of David Zucker, Jim Abrahams, and Jerry Zucker, and became reliably profitable in 1991 with the blockbuster duo of "The Naked Gun 2 1/2: The Smell of Fear!" and "Hot Shots!" The key to a great spoof: pile on the gags and never once allow for a moment of sincere levity. Spoof movies are still going strong nowadays, but, thirty years later, have they gotten better? Consider these highly scientific findings...