Lucky Jane says Make karma your friend.

Touristing the other day, I built up karma points by offering to take group pictures for two separate groups, who had clearly arranged a group photo where one person would be left out (once, in the middle of a truly heartbreakingly beautiful landscape, I offered to take a photo for a group of 12-or-so people. I really couldn’t stand to see 11 people in and one left out).

Anyhow, the karma points paid off when I went to the dentist and managed to schedule TWO return appointments at my convenience, not theirs.