On burgers, it's ketchup, mayo, and mustard (along with pickles, onions, lettuce, and cheese). On hotdogs, it's ketchup and mustard (plus relish, onions, and cheese). On a sandwhich, it's usually boht mayo and mustard (sometimes one without the other) but never ketchup. Oh, and if it is a peanut butter sandwhich, no comdiments except jelly or banannas or potato chips (or fritos).