So you've driven across the country and don't really know the streets of Dublin all that well, but decide to park on Mespil Road. Given that it's Friday night and you're excited about the match, you forget (or don't realise) you have to pay.
Hiding around the corner are the big bad clampers, waiting in their van, ready to pounce.
The match kicks off. Round the corner they come and nail ten cars in a row. At €80 a pop, that's €800 for a few minutes work.
Technically the law, but this would make your blood boil.