Leland ... that pull chain was the cause of my being called there. It seems that the light wasn't working, even with new bulbs. Removing the fixture revealed that the pull chain was 'off.'
To be fair .... the owner had recently evicted the tenants, who had attempted to turn the basement into an additional apartment. Ironically, the light was also controlled by a switch on the wall.
This was the least of the problems I had to fix .... but also one of the most entertaining