Other safety rules I break regularly through familiarity:
Changing cutters/bits/blades with the power on & just the tool/machine switch at "off", I bet most of us do this.
Careless with superglue = stuck fingers.
Stopping lathe chucks/drill chucks with my palm. = Occasional skinned knuckles and friction burns.
Working with a steadily mounting scattering of sawdust/shavings/offcuts/filings/trims on the floor, as a trip hazard. Ditto extension cords on floor.
Occasional use of cement mortar: Using hands as a "trowel" = cement burns and no fingerprints.
Stirring animal glue-pot with finger to see if it's hot yet.
Striking an arc when stick-welding with the visor up. Not often, 'arc-eye' smarts later!!
Checking the spraygun pattern by painting the back of my hand.
And worse of all, too idle to walk down the shop for a pair of disposable gloves when using "just a little dab" of polyurethane glue. Result; ghastly permanent stains all over the fingers, etc. Poison? Allergy? No, much worse, a rollocking!
"We are going out tonight and just look at your hands! - Oh! and is that glue on your new shirt!!"
Alan


Wood work but can't!