Ep 21. The Vegas Renormalization

In The Big Bang Theory season 2 episode 21, titled "The Vegas Renormalization," the gang decides to take a trip to Las Vegas for the weekend. Penny joins them, hoping to get away from her troubles with her ex-boyfriend. However, things don't quite go according to plan when they arrive.

Howard has a gambling problem and ends up losing all his money at the casino. Meanwhile, Leonard and Raj find themselves trapped in their hotel room due to their fear of germs. Sheldon takes this as an opportunity to drive Penny crazy with his constant need for order and cleanliness.

As the weekend goes on, the group experiences various misadventures, including Howard being mistaken for a prostitute by a hotel security guard and Sheldon winning big at the casino but being unable to enjoy the victory due to his strict adherence to his schedule.

Overall, "The Vegas Renormalization" is a hilarious episode that shows the characters in a new environment and highlights their quirks and flaws. It also touches on themes of addiction, anxiety, and the importance of breaking out of one's comfort zone.