An old man gets a call from the radio

'Congratulations, you can win a splendid new Toyota Yaris if you answer the following question correctly. It's got four doors, it's gray and it's got wheels: what is it?'

'A car,' replies the old man.

'Oh no! Not bad, not bad, but we were thinking of a Toyota Yaris. You know what? We'll give you another chance! It's got four wheels, doesn't consume much fuel and it's got an airbag: what is it?'

'A car,' answers the old man.

'Oh no! Not bad, not bad, but we were once again thinking of a Toyota Yaris.'

'You know what, I'll ask a question too,' says the old man. 'Stands on the street corner and sells her body: what is it?'

'Well, that's rather easy: a whore.'

'Not bad, not bad, but I was thinking of your mother...'