Two friends have a drunken reunion, where they dress in each other's clothes. They become mistaken for each other, and wind up having to assume these different identities. With resultant calamitous consequences, to both their careers.
Two friends get drunk and decide to switch identities. One is a Parliamentary Secretary, and the other is the captain of a ship. The former's lack of sea knowledge causes several catastrophes, including torpedoing the First Lord of The Admiralty.—anon