A friend of mine used the scope against his forehead to stop the recoil of a 30-06. He was prone and changing positions with his finger on the trigger. No serious permanent damage, but it nearly knocked him out, a good size cut, a lot of blood, and a bruised ego. Saw another guy (over 60 years old) scratch his ear with a loaded/chambered .45 ACP 1911 with his finger on the trigger. Luckily it didn't discharge.