Getting in for half price

It was England v. Ireland at Wembley. It may have been at that very match when the two Clancy brothers approached the turnstile.

'How much is it?' said Michael.

Twenty pounds,' said the ticket seller.

'Well, I've only got one eye and so I'm only paying ten!'

And, wonder of wonders, the man let him in.

'And I'm only paying ten pounds,' said Owen Clancy.

'Hang on,' said the turnstile keeper, 'you've got two eyes!'

'Yes,' said Owen, 'but I've only come to see Ireland.'