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When my gf and I were living with my mother-in-law, she gave me so much grief re helmets that I ended up leaving the house with one on, go up the road, take it off and hide it under a bush before going on a ride and then recovering it before going home. Got found out when she somehow happened to be driving along the same narrow country lane as me one day. We then moved to New Zealand where we have a mandatory helmet law.
Maybe they just put it on for the last mile so their mum doesnt tell them off.
I got dobbed in once when around 8 years old by a neighbour who saw me riding around the local estate, helmet drapped over bars in a cavalier fashion. Mum gacve me a right earful when i got home.