I remember, in the early 70s, sharing a billet with a group of young police officers, army officers, and naval officers.
After a few days we were all on first name terms.
One night, after lights out, when we were almost all asleep, 2 guys from the east coast of Scotland were chatting and finishing almost each line of conversation with "ye ken" or "ah ken".
An English voice peeps up, "Who the f**k is Ken?"
Very funny.
You had to be there.