Let's see if we have this right: Sean Connery is a cute medieval dragon who breaks into Alcatraz. Psycho groupie Robert De Niro tracks Flipper all the way to Alaska. Schwarzenegger takes the Brady Bunch into Witness Protection. Danny DeVito and Shaquille O'Neal--twins! Bill Murray goes bowling with his pet elephant. A tornado spits a giant spaceship onto the White House lawn and out steps the most destructive alien force the world has ever known: Jim Carrey.
This, at least, is the impression a viewer gets after seeing the trailers--the two-minute previews--for this summer's major-studio films. For months these promos have...