I'll have to wipe my grin off before I go into town Doug - might bump into the local Canon

My dad (a excommunicated Catholic) used to joke about the name of a popular tobacco, 'Three Nuns' "Nun today, nun tomorrow, nun next week'

A prank rather than a joke
Our local beauty spot by the sea used to house a very active convent and school and also a smell popular thatched hotel (now the massive modern Armada Hotel)
They were re-roofing the small hotel at one time using English workers who used to drink in our local music pub Friel's where many of the clientele ans the publican couple spoke Irish
One night they decided to teach the roofers Irish - the phrase “Pog Mo Thoin,” (pron. poge mahone meaning "kiss my arse" was the favourite) - they were persuaded it meant "good morning"
Totally unaware, the lads would shout in Irish at the passing nuns "kiss my arse" until some humanitarian explained the joke
Jim