It didn't really trouble me until one day. I had had a lousy day at work as I had missed a deadline and been chewed out for it by my boss. I had a splitting headache most of the day and had to skip lunch to get my project caught up, which made me pretty irritable. Then it rained and I didn't have an umbrella to cover me for the long walk through the company's parking lot to my car, so I was pretty wet when I got home.

I got into the bathroom and took a nice, warm shower to loosen up. Jen knocked on the door and came...