Ok so the now infamous PWP thread was so much about discourtesy in the end.
What about when someone - a stranger - has done something really nice for you just because you were a mum? Or dad?
I was at the post office with DD2 in capsule a month or so ago. The man in front turned around and said "would you please do me a favour?". I was puzzled but said "sure". And then he asked me to take his place in the queue. It only saved me about thirty seconds but it completely made my day.