How I pulled my shoulder nearly out of joint

I decided that today would be a good day to go shopping for summer clothing. Not so. First of all, I couldn't really find what I was looking for. I decided to just try on a few things, including these cotton shirts that were on sale. I thought that they would be good for warm weather, and they were only about $3 each. Yeah. Sales. But when I tried it on, I realized that you could sort of see through the shirt, and this wasn't necessarily terribly complementary. So then I needed to take the shirt off. And I couldn't, because it was stuck. So I tried all sorts of things, including trying to pull it down over my legs (wouldn't fit over my hips), trying to pull it over my head (nearly ripped it). I'm thinking, "Who designs these things? No wonder this thing is on sale, because it is dangerous." And then after trying all sorts of things, I wondered if I was going to have to call the clerk in the store...b/c I was seriously and embarrassingly stuck in this shirt. But then I had one last attempt and bending over and pulling the shirt over my head with all the power that I could muster. And it worked. But I seriously hurt my shoulder in the process. Not a successful shopping trip.