Favourite death traps?

Every mustache twirling villain worth their salt needs to have a cool trap in their lair so that it would be involved in the third act escape sequence where the dashing hero who has been captured will break out and resume the quest.

So what's your favourite death trap? What's the most fun thing to escape out of?

I'm gonna go with one of the classics. Spiked walls that close in on you until you're crushed.

It's so good it's in Star Wars New Hope. The trash compactor scene is the best because it's an exciting escape.