"Junk food"

Does your cat ever eat fast food meant for people? Do you actually allow them to or do they just steal it? Do they have any favourites and are there ones they leave even if available? How often do they eat it? Do they eat a lot of it each time? We never had fast food in our house so our pets never really had the opportunity to eat any.
Also, can they actually digest it if they do eat it or does it give them problems?

 

Well, I really don't eat fast food at home, but a friend of mine often orders pizza and his cat is always waiting to take a morsel He never lets that happen tho, but sometimes he give the cat his pizza leftovers... which she accepts gladly!!!