Ketchup (yes, it's already in there, lol) and mustard on sloppy joes for me! And just to stick it to the Dirty Harry lovers, always mustard but also ketchup for me on any hot dog or brat, haha.
But, I like yellow mustard on scrambled eggs and most omelettes (unless they cry out for salsa or hot sauce), and mixed with hot sauce and honey with pretzel sticks --- so mustard is kind of a thing with me. As a 5 year old, I'd be up early on Saturday mornings waiting for the signal to disappear from the TV (some of you out there will have no clue what I'm talking about) and the kid shows to start, and would spread some mustard on a piece of white bread and have a little snack in my very large closet, lol. So glad as a mustard lover I was later able to come out of the closet!