Given that sliver of a plot, you probably could write the movie. Odds are you wouldn't be too far off from what the six men credited with creating the script came up with.

After all, the gags will be familiar to anyone who sat through "Tootsie," "Some Like It Hot," "Big Momma's House" or "Miss Congeniality."

There's hardly an original thought in this movie's head. A lot of things don't even make sense, including the fact that the two leading men never really look like women. With their pasty makeup, they resemble Michael Caine — when he donned a blond wig and bad dress in "Dressed to Kill" all those years ago.

Still, dumb and predictable as "White Chicks" is, it's awfully hard to get too annoyed with it. It's genial as it bounces from one lightweight situation to another. It revels in its silliness, and you laugh in spite of yourself.

Much of the movie's charm comes from Marlon and Shawn Wayans.

The two gleefully play agents Marcus and Kevin, who go undercover as sisters Tiffany and Brittany to trap a kidnapper. With the real Brittany and Tiffany secluded in a hotel, the agents meet up with the girls' friends, who wonder why the sisters' appearances have changed so drastically. "Oh my God, collagen!" one of the pals concludes.

The silliness continues. The plot exists only to drape the gags on, and some are quite funny. The "girls" get into a dance-off with stuck-up Hampton types, and end up break-dancing. A macho pro athlete (Terry Crews) with a thing for blondes attempts to seduce Tiffany over dinner: He eats oysters while "she" scarfs down enough food for four men.

Keenen Ivory Wayans directs his little brothers — all three had a hand in the script — and keeps things fizzy and lighthearted. Still, the movie goes on about 15 minutes too long, and the kidnapping bit is never clear. But the Wayans brothers' easy charisma and charming good nature make up for a lot of shortcomings.