I taught a young woman and her father to dance syrtos, because the dad is half-Greek and she wants them to dance it together at her wedding. She said she was having trouble finding someone to teach her, but a friend had been to my dance group a couple of times and put her in touch with me. I had fun, and I think they learned well enough to pull it off. I even taught them the cool trick where the leader and second make an arch for the rest of the line, since they're hoping a bunch of the wedding party will join in. It's interesting to notice how and when one's odd bits of expertise can make someone else's life better.