Movies "in the bath tub" game:

The Longest Day In The Bathtub.

Go in the bathtub

Very Bad Things in the bath tub

and my favorite:

Snatch in the bathtub.

Bambi in the bathtub.

Up in Smoke in the bathtub.

Dead Man in the bathtub

Giant Killer Tomatoes in the bathtub

Chainsaw massacre in the bathtub

Dead Alive in the bathtub

Golden Eye in the bathtub

Kramer vs. Kramer in the bathtub

War of the Roses in the bathtub

No Man's Land in the bathtub

Sometime in April in the bathtub

Apocalypse Now in the bathtub

Halloween in the bathtub.

Before and After in the bathtub

It's a Wonderful Life in the bathtub

Psycho in the bathtub

Godfather in the bathtub

oops, I guess it's not Before and After, but rather Being There...

Soapdish in the bathtub.

Bringing Up Baby in the bathtub

Gentlemen Prefer Blondes in the bathtub

Honey I Shrunk The Kids in the bathtub

Mission Impossible in the bathtub.

Cat People in the bath tub.

The Ring in the Bathtub

3 men and a baby in the bathtub

Little Women in the bath tub

Memoirs of a Geisha in the bath tub

Peter Greenaway's finest (some of these are uncanny...I just started with The Cook...then used www.imdb.com...my brain isn't this packed with trivia!):

The Man in the Bath in the bath tub (2001)

The Death of a Composer in the bath tub (1999)

8 ½ Women in the bath tub (1999)

Darwin in the bath tub (1993)

The Baby of Mâcon in the bath tub (1993)

Prospero's Books in the bath tub (1991)

The Cook the Thief His Wife & Her Lover in the bath tub (1989)

Hubert Bals Handshake in the bath tub (1989)

Drowning by Numbers in the bath tub (1988)

Fear of Drowning in the bath tub (1988)

The Belly of an Architect in the bath tub (1987)

A Zed & Two Noughts in the bath tub (1985)

Making a Splash in the bath tub (1984)

The Coastline in the bath tub (1983)

Four American Composers in the bath tub (1983)

Terence Conran in the bath tub (1981)

Act of God in the bath tub (1980)

The Falls in the bath tub (1980)

Women Artists in the bath tub (1979)

Zandra Rhodes in the bath tub (1979)

Water in the bath tub (1975)

Water Wrackets in the bath tub (1975)

Revolution in the bath tub (1967)

American Werewolf in London in the bathtub.

Splash in the Bathtub
Pretty in Pink in the Bathtub
The Deer Hunter in the Bathtub
The Ten Commandments in the Bathtub
Kiss the Girls in the Bathtub
Loaded Weapon in the Bathtub
Taking Lives in the Bathtub

From the Johnny Depp Collection:

Chocolat in the Bathtub

Finding Neverland in the Bathtub

Blow in the Bathtub

The Man Who Cried in the Bathtub

Dead Man in the Bathtub

Black Hawk Down in the bath tub.