Yeah I bet, but with Americans you never know, I've seen people pour melted processed butter across popcorn, so when it comes to what Americans eat, I've learned to always ask rather than assume.
Well, I don't eat popcorn at all, the "skin/shell" gets stuck in my teeth so not worth it :) My wife though loves popcorn, but I don't think she'd ever pour melted butter over them, too health-conscious for that I suppose.