I was in a shop today and had the following unwanted conversation:
Nosey lady (NS): "were you in an accident?"
Me: "excuse me?"
NS: "we're you in an accident?"
Me: "pardon?"
NS indicates with her eyes to my bike helmet I was holding
NS: "They're stupid things. Do you were it all the time"
Me: "eh, when I'm on my bike, yeah..."
NS: "what!? I have a child and SHE doesn't even wear one! They look so stupid! Hahaha! Even my child doesn't wear one!"
I turn away a bit, still smiling politely.
NS: "why do you wear it? Were you in an accident? They look so stupid!"
Would I have been unreasonable to whack her in the head and then yell "SHOULDA WORN A HELMET!!!!" 
