My cat will come running if she hears me opening a crisp packet. She's not interested in the crisps, she's waiting for me to finish the packet and fold it into a triangle so she can play fetch with it!
One of ours used to love crisps - would come running at the sound of a packet being opened. DH once cruelly fed her a super hot chilli crisp, but even that didn't put her off for long. She wasn't picky about flavours, either. She also liked McDs, and would eat a burger complete with bun (but not the gherkin)
It is probably self evident that she was a cat of our irresponsible carefree pre-DC life - she grew up along with us when DC1 arrived and decided he was an adorable if very slow kitten.
My old old cat will lick the inside of a crisp packet if he gets hold of it. He also used to have a taste for chilli con carne, curry and similar spicy foods (he would pinch a bit when our attention was elsewhere)
He's nearly 18, so his longterm health hasn't been radically affected by his weird tastes, but I won't be encouraging my younger cat to follow the same dietary habits!