My DH always leaves the top of the mustard open and I was just using it and asked him to please close the bottle when he's done. I don't know why it should irk me that he doesn't but for some reason it does. Anyway, after I asked him to keep it closed he jokingly told me to kiss his butt. Then I jokingly squirted him with mustard.
That'll teach him to get smart with me.