This is a nice little flick starring the Looney Tunes and some cameos by Hollywood stars (and has-beens) that you'll forget minutes after you watch but it'll be some distracting entertainment for perhaps a rainy day.
The main idea is that Brendan Fraser stars as a security guard at the Warner Bros (he was once the stunt double for Brendan Fraser in The Mummy, apparently) who learns his spy father was on a mission to rescue a diamond that can turn people into monkeys before it falls into the hands of the head of Acme, played by...Steve Martin in a ton of make-up. He's trailed by Jenna Elfman as a studio executive, and Bugs Bunny and Daffy Duck, the Duck who recently was fired from show business.
There's some cute in-jokes, and references to such films as Robot Monster and Invason of the Body Snatchers, and a cute romp through some paintings at the Louvre (a green-screened Paris). The backgrounds are pretty, the jokes sometimes fly and sometimes don't, and the Looney Tunes are still hilarious. The plot...does it really matter? No, not really, but still this might be a good film if you're looking for something to pass the time with that won't tax your brain.