1 Monty: If that Dr Smith can navigate this labyrinth without thread, so can we. Let's press on!
2 {scene: They press on into the depths of the labyrinth, with no thread to guide them}
3 Prof. Jones: Er, Junior? What if she can't?
4 Monty: Hmmm... You could have mentioned that possibility earlier, Dad.

2014-02-24 Rerun commentary: Some years ago, the Art Gallery of New South Wales had an art installation that was a giant labyrinth constructed in one of the large exhibition rooms. The catch was that is wasn't lit inside the maze. Once you walked in and turned a corner, it was pitch black. People basically wandered in, and stumbled around in the dark, feeling the walls and, inevitably, other people, as you moved around.

I went in with a few friends, and it took us maybe half an hour to an hour to find our way out again. Very cool.