Last night, due to tiredness and generally being spacey, I had her reins in my hand, no lead rope. As I was trying to place the saddle on her back, she was circling me, trying to evade the saddle, and somehow the reins got yanked out of my hands. Of course, she stepped over and through the reins, which resulted in her putting a ton of pressure on her own mouth and absolutely freaked her out. Luckily, it was only about a minute until I could get her to stand calmly to unbuckle the throat latch and get her bridle off, but a minute is far too long to have her scared, upset and probably in pain.
I felt and feel horrible. I know better, and I was just being lazy. I could have injured my friend's horse, and I'm hoping she isn't going to have horrible associations with the bit/bridle now. Honestly, it's very embarrassing to admit this, but it's a good reminder to always be an aware, cautious and responsible equestrian.