This morning I put in my contacts and realized that I had had an eye appointment weeks ago but hadn't received my contact lenses yet. I was completely out. So, I went to the main office, and sure enough, there they were. I took them back to my apartment, and then took out my old left contact, and put in one of the new ones. Ahhh, much better. I did the same for my right eye... except I forgot to take the old one out. I ended up with two well-stuck-together contacts in my right eye, which was clearly uncomfortable, so I took them out and fixed the problem.
I think I threw away the wrong contact. My left eye is moist and happy, and my right eye is dry and uncomfortable. I've had my new contacts for a few hours, and I've already ruined one.