Do you just go through pizza places and do it to random people, or friends who ordered it for themselves?
Because either way, that's being a massive dick.
I mix ketchup and mayonnaise to dip my tater tots in. Texans seem to think this is the most alien thing in the world (reactions up to and including "what the fuck are you doing?!?"), although folks from other parts of the country don't think it's odd.
I eat the crust of the Pop-Tarts first before eating the part with the filling. Sometimes I just throw the part with the filling out and just go to several Pop-Tarts for the crust.
Apparently, it's also weird to eat plain yogurt with no toppings or anything.
She would threaten to do it in front of me sometimes but I would make sure to never have crisps around when she was over. However she sent me a snapchat video one time and it was at that point I knew I had seen some of the most vile video footage ever.