Season 8, Episode 5 - The Focus Attenuation
Aired October 13, 2014
When the guys want to spend the weekend working on science projects, the girls opt for a weekend trip to Vegas. After Penny receives an email from work bringing forward a deadline, she chooses to spend the night studying instead of partying, while Amy and Bernadette go out on the town. Meanwhile, the guys' efforts to invent a hoverboard never get off the ground when they keep getting distracted.