I work at a French restaurant. We mostly have a lot of seafood and desserts that are over the top rich. I have a serious sweet tooth, and even I can't finish the fudge or the pot de creme (pudding, basically) that we serve.  But yeah, they totally ordered tuna basquaise (Google it) and the gourmandise (a super rich chocolate thing that I can't eat because it's just too rich).  You are correct about the diet coke.