I’m not a huge fan of grammar pedantry, but I loved this exchange from Kiss Kiss Bang Bang. (Delivered by SWOON Michelle Monaghan)
Harry: I’m interrupting. I feel badly. What are you drinking?
Harry: Bad? Sorry?
Harmony: You feel bad.
Harmony: “Badly” is an adverb. To say you feel badly says that the mechanism which allows you to feel is broken.
Kiss Kiss Bang Bang really is one of the great underrated films.