A few weeks ago, a friendly stranger came by the mobile repair stand with a new chain. As it turned out, her broken but otherwise quite nice chain was perfectly salvageable with the removal of a link. This left the new chain without a destination, so she decided to leave it in our parts bin.
Earlier tonight that chain saved the day (night?). The mobile repair stand, with chain in tow, happened to be in the right place at the right time to get the chain on a bike that needed one badly.
So, thanks friendly stranger! You earned some major bike karma tonight.