Blind Dave is in a pub.
He says "Bring me any football, and I shall tell you where it's from."
A man fetches a football over and Dave shakes it next to his ear.
Dave says "It's from Newcastle, I can hear the Magpies."
The man is shocked, but applauds him. Another man tries it, fetches a football, and again, blind Dave shakes it to his ear.
"It's from Norwich, I can hear the canaries."
Again Dave is correct.
A 3rd man fetches a 3rd football, and blind Dave shakes it next to his ear.
He says "It's from Coventry"
The other man says "Can you hear the City roar?"
Blind Dave says "No.