Oddly I went hiking with my then girlfriend and discovered that I'm not great at altitude. I believe I told her that she should go on to the top and I'd just sit down and take a break. Maybe a nap. To her credit she saw that for awful idea that was and instead slowed down and encouraged me onward.

I'm not saying that's why I proposed but it definitely didn't hurt. It was just one more instance that reality threw in my face that the two of us worked well together.