I was pulling a boat up on the beach when I hung up on some seaweed. I got mad, yanked really hard and felt something in my back go "pop". By Monday I was almost crippled when I finally got to see a Dr. The Dr examined me and did some tests. Then he came and "said "Good news, you pulled a muscle in your butt!. If it had been your back you would be laid up for months because the back is under so much load. Since you mostly sit on your butt, it will heal in a week or so"