The Big Bang Theory Episode 1.03 The Fuzzy Boots Corollary

When Leonard sees Penny kissing a guy in front of her apartment door he is devastated. The guys convince him to ask someone out at work, but when he tries and is brutally turned down by a geeky girl, he is even more depressed. Wolowitz conspires to take them all to salsa class at the community center, where he meets all of his conquests. The women there are all 85 and up or 6 feet tall. Leonard finally decides to ask Penny out to dinner and just when he thinks he is making progress, she tells him that it is too soon for her to start dating again.