Years ago my friend was over from Canada visiting me in Edinburgh. We walking along and were waiting for the pedestrian crossing lights to change. They made that bleeping noise as it changed to .
She asks "Why do the lights make that noise"
I reply "It's to let blind or partially sighted people know the lights have changed"
She thinks about this for a minute, then says "We don't let blind people drive in Canada...."
I started pissing myself laughing and she realised almost immediately. She's a Doctor now and we still refer to the blind person driving...
