My favourite, though slightly off theme, is of the woman who asked her husband to go to the shop for a pint of milk, adding, " and if they've got any eggs, get six". He came back with six pints of milk. When challenged he replied, "They had eggs".
This is not as funny as the previous answers, but one that tickles me.
My boy and his grandad were sitting in the garden at dusk. A bat flew over them, grandad said "oh look, there's a bat." Son said "what kind is it?" Granddad said "Half past nine".
Again I digress, prompted by Stuey. Two guys touring Wales. They come to the town of Machynlleth and stop off at a cafe. One of the guys asks the waitress how to pronounce the name of the place they were. She replies, "B U R G E R K I N G".
I remember when I was at school, I ended up talking to another girl about a film that had been on TV the previous night. I mentioned that two characters in the film were mormons but she must have thought I said morons. Because she said That's not nice.
A university porter asked the new lad to buy him a pack of cigarettes at lunch time.
What sort? the lad asked.
Number 6 the porter said.
What if they don't have them?
Oh bring anything.
Lad came back with a pork pie!
You told me to bring anything if they didn't have number 6 the lad said!