How do you get down from an aerial ladder?

A. You don't get down from an aerial ladder. You get down from a duck.

What do you call a duck that gets all A's?

A wise quacker.

What is a joke that only makes sense in your own regional dialect/accent?

Sorry for a post that's not a joke but I'm interested. Here's one from where I am. These two ducks are flying over Ballymena. The first one says, "quack quack" and the second one says, "slow down! I'm coming as quack as I cyan."