i'm not the least surprised it's never been used

1. the song really sort of sucks. yes we all love it cuz flo at least got a lead. but it's really not all that great. frankly it's not even her strongest lead from this period
2. no one other than die-hard fans are aware of it. it had 0 national chart presence and 0 national impact
3. when an advertiser is looking for a jingle or to tie in with a popular song, they're looking for just that - popular. since no one knows this, why would someone decide to use it?
4. and for what possible promotional activity would it be used - popcorn? movies? Theaters typically do not advertise, the studios and the individual movies do that. From a snack food perspective, popcorn isn't all that big. just walk down the grocery aisle and you'll see endless potato chip, cheese puffs, etc. popcorn is not a large % of the overall snack market.