Battlestar Galactica - Season 1: Episode 9: Tigh Me Up, Tigh Me Down: That dinner scene was the most uncomfortable time I've spent watching this show; hands down. Seriously, I was looking through barely-parted fingers at points. Man, talk about an insidious weapon! Ellen Tigh (Kate Vernon) is chaos in a black dress!
James Callis also put in an excellent performance. Baltar really seemed to embrace his madness in this episode. That closing, with him swiveling his chair back and forth, was priceless.
Oh, and did anyone else notice how Space couldn't get its disclaimer right? Half the time they would return from commercials warning us about the show being a paid advertisement. :-D