My kids didn't have school today due to a teacher inservice so I took them to the SpongeBob movie. It was the craziest thing I have ever seen! It did have a lot of funny stuff. It definitely held the boys' attention for the duration and the ending was the best part.
If you like the show, you'll like the movie. If you don't know anything about the show, you will be very disturbed by the movie I saw a lot of dads there with their kids and the dads were laughing as hard (if not harder) than anyone.
My 8yr old said it was even better than he thought it would be.