Bernadette: I still think he looks like someone's pet.
Howard: Don't play innocent with me. I practically invented using fancy lab equipment to seduce women.
Season 6, Episode 13, "The Bakersfield Expedition"
Season 3, Episode 11, "The Maternal Congruence"
I'm Wonder Woman Shhhh!
Season3, Episode8 - The Adhesive Duck Deficiency
Season 3 Episode 13 – The Bozeman Reaction