well, I went to see if I could find the name of the compound I referred to.. I found a thread where Dr. Lipton mentions it (diacetyl, though he says microwave popcorn not movie theater). But interestingly the OP is the same guy. Short memory!

https://groups.google.com/forum/?fromgroups#!searchin/alt.food.wine/buttery$20popcorn/alt.food.wine/wkmdmoFe47g/57XDIoWkmQEJ