Ep 6. The Irish Pub Formulation

In The Big Bang Theory season 4 episode 6, titled "The Irish Pub Formulation," the gang decides to celebrate Halloween at the local Irish pub. However, tensions rise when Bernadette and Amy decide to dress up as sexy kittens, causing Penny and Sheldon to argue over the sexual objectification of women in Halloween costumes.

Meanwhile, Howard and Raj are excited to finally be able to legally drink for the first time, but their plans are derailed when they run into Bernadette's ex-boyfriend, Glenn, who is also a police officer. The trio's attempts to impress Glenn with their drinking skills lead to chaotic and embarrassing situations, and they soon regret their decision to challenge him.

Back at the pub, Leonard tries to impress a beautiful woman named Alice by pretending to be Irish, but his deceit is quickly exposed when he fails to correctly say a Celtic blessing. Alice is unimpressed but agrees to go on a date with him anyway.

As the night comes to a close, the gang's Halloween celebrations are cut short when they realize they have forgotten all about Raj's dog, Cinnamon, who is still locked in the apartment. They rush back to save him, and the episode ends with the gang snuggled up together on the couch, content in each other's company.

Overall, "The Irish Pub Formulation" is a hilarious episode that explores themes of gender roles, cultural appropriation, and the perils of excess drinking. It showcases the unique personalities and dynamics of the show's beloved characters, and serves as a perfect reminder of why The Big Bang Theory became such a popular and enduring sitcom.