This trust fall has now been built to a much higher height (I mean a really high height!). There are a few great companies out there that have taken this concept to the extreme and built high ropes walks and pole climbing (where you have to stand on top of the pole with no rails to hold onto). Now you do have a harness that they can securely bring you down with, if you fall, and your team belaying you, thus the TRUST factor. I went to a high rope course with my "at risk" group of which I am a mentor. We headed out in the early morning and spent a whole day trying to help each other over walls, walking on a beam and helping each other not fall, climbing up what looks like a telephone pole, and last, walking across a high ropes course designed to scare the heck right out of you. The purpose is to encourage you to work as a team to complete the challenge and to build each others trust. I loved it!
I actually think this should be a prerequisite to those couples engaged to see how they could work together under pressure. Heck, this would be a great engagement gift. As for the teens, this would make a great family activity with them because face it, you would be totally cool and, of course, sometimes teens need to remember that their parents are the ones they should always trust when they are in a jam.
There are many rope courses around the US but here is one.
If you have ever considered being a mentor and you live in Arizona you can check out the Phoenix New Pathways program. Most other states have Youths At Risk programs as well.