Mozzarella stick
The worst thing that can happen to you while out on a date is, getting a long piece of mozzarella stuck to your mouth. You could try to play it off as a silly joke and attempt to share a life with your date, but that does not work all the time.
Usually, it just looks silly no matter what you do and makes you look like you don’t know how to eat normally. This is usually not a good thing to show someone while you are just getting to know them. Bad table manners are something you reveal to them at least a month into the relationship.