Maybe an oldie for some of you, but I just heard it, so bear with me ...
Old woman goes into the greengrocers, takes a look around and goes up to the counter.
"I'd like a pound of broccoli, please."
"I'm sorry, madam. We're clean out of broccoli, and we won't have any until the delivery tomorrow. How about something else? We've got some nice, fresh spinach. Maybe a pound of spinach?"
"Mmm ... well ... no, just the pound of broccoli, please."
"No, you don't understand. We won't have any broccoli until tomorrow. What about some runner beans?"
"No, thanks. Just a pound of broccoli."
"There's no broccoli! I can let you have some cabbage, or some Brussel sprouts?"
"No, I really want that broccoli, if you don't mind."
"Look, madam ... can you spell 'cat' as in 'catastrophe'?"
"What? Well , sure ... C-A-T. But what's that got to do - "
"And can you spell 'dog' as in 'dogmatic'?"
"Of course, D-O-G, bu I don't see - "
"Just one more, madam. Can you spell 'fuck' as in 'broccoli'?"
"What? there is no 'fuck' in 'broccoli'!"
"That's what I'm trying to tell you!"