In all Wes Anderson films, you can see an underwater shot. The number of people under water increases in each film.

1st - Bottle Rocket: You can see Anthony (L. Wilson) swimming in the motel's pool.

2nd - Rushmore: you can see Herman and a little kid under water in the party of Herman twins.

3rd - The Royal Tenenbaums: You can see Royal (Gene Hackman) and the two sons of Chas (Ben Stiller), Ari and Uzi, in an underwater shot.

4th - The Life Aquatic: There are a lot of underwater shots, I dont know which one is the "official one," but it must be one where four characters are seen under water.