We’ve really been into popcorn lately, using the recipes offered in Leanne’s Brown’s Good and Cheap (free PDF available here). This here is the lime juice and chili recipe. Putting lime juice on popcorn is kind of weird (since it makes it shrivel a bit) but it’s great because then you don’t need as much butter; the lime juice would make the chili powder stick even if you had no butter at all.
Popcorn is dirt cheap, and it’s quite healthy, too, especially if you prepare it by just microwaving in a brown paper bag and don’t go overboard with the butter. But spices? Go to town with those, because all they add is flavor, not calories! (Okay, they’re technically not calorie-free, but almost.)