I learned how to make them when I was in Iraq in 2004. Up until then, I had never seen or heard of anyone wearing them until I saw one on a guys wrist from a different unit. He showed me how to make them, and one day when I was bored I did it for something to do - plus, I thought it was cool.
The one I made had to be tied with a knot to my wrist, and therefore it couldn't be removed without untying the knot. So, I wore it 24/7. Then, I started getting superstitious, because one day I noticed that I had thwarted death a handful of times since I made the bracelet. One of my team members told me "Do not take that thing off until we get home!"
I kept it on my wrist for the entire deployment, and had several more close calls... but I got lucky. I didn't actually believe that the bracelet was a good luck charm, but I wasn't going to take any chances by removing it!
When I got home, I took it off and it's somewhere here in the house... not sure where. I've made a lot of them over the years for friends and family, but I don't wear one anymore because I find wearing a bracelet to be annoying now. It doesn't help that everywhere I turn I see someone with one of those bracelets and I find it to be "trendy," and I hate being trendy.
I think I would be more inclined to wear one if it was still like it was in 2004 when only a select few people knew how to make them and wear them; back then, you pretty much knew that someone with a paracord bracelet was in the military. Now, it's mall ninjas and preppers...