Without a doubt, one of the worst dates I’ve ever had was the guy, a few weeks ago, who spent 3 hours discussing the technical minutiae of computer installation. I got lost after the first five minutes, couldn’t ask any questions because I didn’t have a clue what he was saying, just kept saying "mmhmm", and he decided I was the best conversationalist he’d met in years.
Adding insult to injury, when the date was over, he expected me to pay half. I am willing to go out with a bore a second time, to see if he was just nervous on the first date, but I’m not willing to pay for the privilege of being bored stiff!