This is something I was introduced to in Ipswich, and I can see it being a once in a blue moon thing. Mainly because of how unhealthy it is but also because now I'm back in Cornwall I can't just wander down to the american grocery store again to get the salad seasoning.
Make your popcorn (either nuke or pop), toss in large bowl with ½ stick melted butter, and generous shaking of parmesan cheese and McCormick's Salad Seasoning. Very greasy, extremely high calorie and addicting!