An old man goes into his local papers office and asks if he can place a notice in the paper.
'My wife has just died, how much is it per word?'
'It's £2 per word sir'
'Oh ok, can the notice say 'Doris is dead', that's all I can afford' says the old man.
Feeling sorry for the old timer the lady at the paper says he can have 3 words for free.
So the old man thinks for a minute and says 'That's very nice of you, I'd like the notice to say 'Doris is dead. Metro for sale'
Its a bit like the one about the dog and was sending a telegram saying woof, woof, woof, woof, woof, woof. The counter clerk said well you can send 4 more woofs for the same price. The dog said no thanks, that would change the meaning entirely.