Ah thanks, I thought it was just me. I've always suspected (without testing) that I might be on the low end of the Asperger's Syndrome scale. Fully functioning, articulate, and worked in a technical profession all my life, but devoted to detail and really not understanding a lot of human behavior. I love good cerebral jokes, and bad puns are a delight, but some humor escapes me entirely. So do subtle non-verbal cues between people. OK then, glad I'm not alone on this.