Episode 2x15 of The Big Bang Theory:
Also, I can't believe Sheldon likes Ms Hofstadter. She reminds me of Leslie Winkle more than himself. ;-) Otherwise, her hypotheses about the childhood are surely worth thinking about.
This episode had the highest rating, 8.1, so far, with the share being 12, also a record. The number of viewers seems to be safely above 10 million at this moment.