Hello, Hello Kitty!

Season 1 Episode 14 – The Nerdvana Annihilation

Do you remember this scene?

Season 5, Episode 22 - The Stag Convergence

Tweety Bird

Season 1 Episode 13 – The Bat Jar Conjecture

Sheldon: You're in my bedroom.

Season 2 Episode 03 – The Barbarian Sublimation