Alright i'll toss in my 11 years and bearly $.02
I opened my shop 15 months ago and tell my guys at least 3 times a week to grab thier safety gear for one reason or another. i am big on eyes, ears, feet, and flash. We work with a bunch of a/c guys as well and i always harp on thier new guys about knockin duct w/o ear plugs. I ask if they like music and if they want to be able to in 10 years.
My favorite line is if they want to prove they're a man to someone else on the job, show them your *#@&!!!. maybe some day they will work for someone who doesn't care. Protect Yourself