What was your worst experience as a forum owner?

Once I worked hard on a forum for well over a year and had to shut it down when I got a job and ran out of time to run the forum. I thought about selling the forum but by then, the forum traffic and membership had dwindled so much, it was difficult to sell. So I shut the forum down. I'm still thinking about reopening the forum. That was the worst experience I've faced as a forum owner.