I mean, breaking the mac and ketchup down, it's just a plain cheeseburger minus the meat in a bowl. Throw in some hotdogs and it's effectively cheeseburger remixed.
I’ve had Mac and cheese with some ketchup mixed in. Honestly was great until my folks thought it was odd and told me to stop eating it with ketchup. I might get Mac and cheese with mustard a shot sometime.