One movie that always made me laugh (but I love it) Is "Where Eagles Dare" with Clint Eastwood and Richard Burton. Although its also an espionage movie, it parallels so many acts of the different Secret groups, Like the OSS (Clint Eastwood plays an OSS assassin, very well) and the groups from MI-5.
What’s really funny are those never ending supplies of bullets, explosives, guns and stuff coming out of those backpacks. Still just got to love it.
My other favorite movies are:
Sgt. York
Run Silent, Run Deep
The Pink Submarine (Operation Petticoat)
Father Goose
The Great Escape
The Mackenzie Break
And last but not least…Spartacus