Well, my wife and I were married in a toilet - it was a marriage of convenience!

A typical Tommy Cooper one-liner built on a pun: “marriage of convenience” ordinarily means a pragmatic, non-romantic union entered for advantage, but Cooper literalizes “convenience” as a public toilet (“the conveniences”). The joke depends on sudden re-framing—starting with a seemingly personal anecdote about marriage, then undercutting it with an absurdly literal setting. It also plays on Cooper’s stage persona: deadpan delivery, mock-confessional setup, and a quick twist that turns domestic life into wordplay. The line exemplifies his broader comic method of taking familiar idioms and forcing them into their most literal, ridiculous sense.