I've got lots and lots but here are two:
Flew up to Benbecula last summer with BA (spit swear) who managed to lose my bag. Stupidly I'd packed all of my gear and ds's gear including his teddy (who he can't get to sleep without) in it (needless to say all dh's gear including fishing gear arrived no problem).
there is only one shop on south uist that sells clothes afaik and it wasn't fantastic, but i did manage to get some knickers for me and ds and socks but that was it, we had the clothes we stood in and nothing else.
I phoned benbecula airport on the hour for the next 3 days, could not get a number for lost luggage glasgow from anyone, given short shrift by BA customer services, apparently no one knew where my bag was, except that I knew fine well it was at glasgow and hadn't made the connection to Benbecula.
Posted a huge rant on MN. Next day midnightexpress went to the airport, found my bag and got it on the next flight (I'm in tears remembering this). She said something like 'oh, i've got not much on this morning and don't live far from the airport'. But she went massively out of her way for me and I'll never forget it, Thank you so much you lovely lovely woman!
Second one, was interrailling aged 17 with then boyfriend. We missed a connection and realised we had 15 hours to wait in Milan (i think it was), were short of money, hadn't budgeted for the hotel there. The people we were on the train with said get off with us in Bologna and spend the time with us instead of walking the streets of Milan. They took us to their mum's apartment, an amazing one in the centre of Bologna with frescoes on the wall, fed us an amazing lunch. put us in a huge double bedroom with a beautiful white crisp sheeted bed in it (best bed we'd seen for about 3 weeks). we slept for hours and then they took us to an incredible restaurant for some of the best food we'd ever had or that i've had since. Then they drove us to the train station and saw us onto our connecting train. Can't remember their names but they were lovely people.