The canned/tinned
mystery meat that appeared in the movie
Waterworld.
Society is so FUBAR in that movie, that
the people actually look forward to being able to eat it.
The makers of Spam must have known that Waterworld was going to be
box office poison, because they didn't even want the
product placement/endorsement. The movie producers ended up using a cheesy rip-off called "Smeat" instead.
In a time of
celebration, Dennis Hopper's character threw cans of Smeat to his crew - and, strangely enough, they didn't run for their lives.