I hate it when the grown ups fight.
To get back on topic ain't no need to swear to be funny. I would say if the diplomat farted, Churchill would need to say something like:
"My dear General DeGaulle, did you step on a duck?"
"Mais oui, zat one was a meal in itself, non?"
well I almost laughed. No swears. I'm sure someone else (less drunk) could do better
In contrast:
For truly innappropriate humour without swearing:
Joey Deacon.
For appropriate humour with swearing, consult early Eddie Murphy
For innappropriate humour with swearing consult Bernard Manning. Then sh*t through his letterbox.
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Please replace the handset, and try again.