I was in Tokyo (Shibuya) meeting a friend and asked in Japanese a random kid (maybe 17) to help me find the Hachiko statue. He got really excited, ditched his friends, and escorted me all the way there. Similar story once when getting a train from Tokyo out to somewhere more remote -- the lady in the ticket booth said the train was coming soon, took me by the hand, and ran in her high heels to guide me to the proper track.

Whenever I spot tourists lost in my town I do these sorts of things for them, so that I can set their understanding of my entire city from just my one interaction.