Rant: That customer who refused new brake pads nearly killed himself

Last spring a guy came in with a road bike from 2008, pads worn down to the metal. I told him it was a $35 fix, but he said he'd just adjusted the cables and they felt fine. I showed him the wear indicator and the scoring on his rims with a flashlight. He got defensive and said I was just trying to upsell him, so he rode out. Two days later he came back on a bus with the front wheel folded and a gash on his chin. He told me the brake grabbed and threw him over the bars at a stoplight downtown. He bought the pads without a word and I installed them. Anyone else dealt with customers who treat basic safety parts like a scam?