Depends on your definitions! I’ve been experimenting with the effects of gravity on the human body for years now and have no end of scars to show for it. Basically I fall over sometimes. But in the lab? I think the worst thing I ever saw was someone walking about with a glass bottle of concentrated acid in their pocket which broke and got acid all over them. We got them under the shower immediately and they were absolutely fine, but it could have gone pretty wrong. Don’t put chemicals in your pockets. Top tip.