The one most people think is the weirdest of mine is Chicken-n-a-Biscuit crackers with easy cheese topped with a Terry's chocolate orange slice. Yummy (If you are wondering, I had gotten home from the grocery store and had those three snacks, and couldn't decide which one to eat, so I just tried them together.)
Peanut butter on celery is normal. People that thinks it is weird, are weird.
I also eat mayonnaise on my french fries (chips) normal for Germany, but not in the US.
If I eat cereal (which is extremely rare, I am not sure I remember the last time I did) I eat it dry, no milk. I am not a milk fan.