I have deadlifted maybe a dozen times since the mid 80's. I ruptured my L4 and L5 in 83' or 84' So I don't do it much. Well a few years back I had to showoff. Soe kids were deadlifting and they had 500 on the bar. They were done and I was just sitting there benching when one of them said "Keith you can do this easy uh"? I said I don't know but I have done 735 but it was a while ago. They almost dared me so I had to do it. S with no warmup, belt wraps straps or anything I went over to the bar. Well I eneded up doing it. They couldn't believe it. Well I said see and I walk away very quickly. I went into the managers of the gym office and collapse on the floor. I hurt my back so bad. I literally had to lie there for awhile till I could get up and walk all crooked to my car. That taught me never to show off again. I was layed up for over a week in bed