I was thinking today about that subset of humour that's impenetrable to outsiders because they lack local cultural knowledge essential to the punchline. For instance,
"What's hairy, smells of fish and rhymes with 'funt'?"
Australians are likely to at least be somewhat amused by the answer "Rex Hunt", but anyone else in the world would be left scratching their heads and wondering what the hell's wrong with us.
Similarly here in Perth anyone who lives in the suburbs of Innaloo or Upper Swan will be grimly aware of the sniggers their domiciles elicit, whereas a visitor from Sydney would need an explanation...
"Where do you live?" "Innaloo" "And you?" "Upper Swan"
So, assuming you're still with me, what jokes are appreciated in your neck of the woods, but puzzle the hell out of outsiders? (With explanations where necessary)
Couple of guys are walking down the street when they hear recorded music. "Unforgettable..." "That's Nat King Cole" says one. "Well who is it then?" says the other.
Guy gets into a taxi and says "Ladas Drive, please". Taxi driver says "you'll sit in the back like everybody else".
A Glaswegian one:
Guy goes into a bakery, points at one of the items, and says "is that a cake or a meringue?" The assistant says "aye, it's a cake".
Understanding the "Ladas Drive" joke is made difficult not only by the need to "hear" and interpret the accent, but also by the need to understand that "us" is often used in the local dialect as a first-person singular pronoun.
Errm, yes, sorry about that, i should probably have kept that little gem to myself. No doubt the whole line of Lada/Skoda jokes (Why do Ladas have heated rear screens? To keep your hands warm in the winter!) exist under a different guise in the States.
The Jewish tradition of "Herschel jokes" (Herschel being a faithful and generally virtuous man, but also kinda dim in the brain department) are some of my favorites. They've shown up in various guises all over the world, but they humor is so quintessentially Jewish that you almost can't call them anything but Herschel jokes.