My son is a macho dude who has to learn everything by doing it himself.
Fortunately for us, he has always ridden with a bike helmet (from a very young age) so this was never an issue. He had taken to riding without gloves and protective glasses.
On a ride recently a large insect hit him so close to his eye that his eye teared for miles. He came home and found his glasses after that one. He told me he was glad it wasn't a bee.
Then he was horsing around with his girlfriend this year; she actually grabbed his handlebars and he went down hard on his hand, wearing no gloves.
What a mess! He had to go to the ER twice, the second time was because the first time they didn't pick alll of the rocks out of the deep wound. He has a horrible scar (his hands are already scarred up from other incidents) but
it took forever to heal. he wears his gloves now...