Well, definitely arguing with my mom over me going outside in winter with hair that wasn't fully dry, when I didn't have time or I'd miss the bus and be late for college. I usually dry my hair enough that if I cover it with a hood or hat during colder days I'm perfectly fine, but she insists that one of these days going out with wet hair in the cold is gonna get me sick, which has never happened. I ain't changing the habit of not fully drying my hair after I get sick from going out with wet hair and that is the sole cause of me getting sick (so, probably never).
I'm lucky I don't live in an area where it normally gets cold enough for my hair to freeze during the cold season. Closest I've ever had to that was a miserably cold winter last year. Only subzero winter I've ever been in and I would never wish it even on my worst enemies.
This happens every time I go outside without a coat during winter. If I'm going to the grocery store, and I'm only outside for 60 seconds, I dont need a coat. Obviously if I was going on a hike then I'd need it.
Where'd this myth even come from about cold causing colds? Its even in the name! I can't imagine how many hours of pointless arguing occurred between parents and children because of it