When I was in grade school, I read a book in which the protagonist loved peanut butter and lettuce sandwiches. Intrigued, I tried one for myself, and from that day on, I have never eaten a PB sandwich any other way. The lettuce adds crispness and moisture; it's delicious. In later years, my favorite sandwich evolved to become mesquite turkey, spicy mustard, PB, and lettuce. It's a great combination of flavors, but since I have been trying to stick to a vegetarian way of life, I don't eat those any longer.
I loved A-1 sauce as a kid, and would eat it on saltine crackers.
In college, we frequented a pub that gave out free, delicious popcorn. In time, I came to discover that popcorn dipped in draft beer was a real taste treat. Not quite as extreme as my then-bff, who loved dropping Resse's Pieces in her beer.