[Cerium]

David Bull (in one of his YouTube videos [1]) relates a piece of similar advice he was given. An old carver advised him when he was younger to never scratch his face with his carving hand. Apparently accidentally impaling your eye is enough of a risk to make this safety habit an oral tradition.

[1] https://www.youtube.com/channel/UCKSrgKjevPmNZxCAyTZP5cQ

[cafard]

Back in the days when one did "paste-up", I removed my X-Acto knife from the work with a flourish, and it stopped in my thigh. There was no significant damage, but I was more cautious after that.