That's right. The world is full of people who can't remember whether they had PPI. Some people picked it up in an unfortunate sexual encounter in Sutton Coldfield. Others were simply taken in by somebody they met on holiday in Worthing. And until now, there was no diagnostic test for PPI.
But now it's easy. Simply tap yourself on the head with a credit card.
If your cat's eyes glow, you've had PPI.