Was having a discussion with some friends about "things" that became major characters in movies to the point they made a cultural financial difference. Ones that come up.
Dirty Harry and the S&W M29 .44 Magnum. Prior to the movie 29 sales were so low it was cataloged but they weren't bothering to make more. After the movie if you could find one expect to pay triple.
The GPZ900R Ninja was a hell of a bike when it came out but achieved instant icon status from Top Gun.
Perhaps not a "thing" exactly but I've heard it said from many in the fly fishing business that there was a distinct before/after the release of A River Runs Through It.
Other nominations?