There's something quite odd going on in our house. A couple of weeks ago Mrs. Dufus and I were parked in front of the television. We'd just settled in for the next instalment of The Amazing Race, at 8pm, when the doorbell rang. My wife got up to see who was at the door, she being closer. When she opened the door no one was there. Odd. No. One. There. Was someone playing a trick on us? A little past Halloween, you know. Hmm. Several nights later the wife and I had assumed our positions...in front of the television. We'd just started watching the 10pm news when ding dong. "Who the hell's at the door at this time of night?" I barked and this time I went to the door. There wasn't a soul in sight. Hmm. The odd thing about this is we have security lights outside on motion detectors. Each time all was dark. Hmm. The other morning at 5:30am I was awakened by...you got it...the doorbell. Now our doorbell doesn't just go ding dong. Oh, no, we had to set it to t