Quicksand Fans

In the movie "Dungeons And Dragons", a man stealing things from a bad guy's lair steps onto a carpet and sinks into it, getting pulled out by the bad guy:

https://www.youtube.com/watch?v=yH0lx4BqqcI

Wouldn't that be a cool thing to have? Every one of us would own one and become a terrible nuisance, spreading it out in front of unsuspecting folks. And probably getting ourselves arrested for endangerment.
There was another one of these scenes, starring Nicolas Cage, as I recall. I think it was in "The Sorcerer's Apprentice".

A quicksand welcome mat in one of the Addams Family movies

And then there's...

There was also supposed to be a scene in Batman Returns, it was a sand trap meant for the character chip, but it was scrapped and never shot. Too bad I thought the actor who played him was kind of hot.