"Get your women in line!" -Sheldon
"Good night. And if there's an apocalypse, good luck." -Sheldon
"I'm not crazy! My mother had me tested!"
"If you can eat this cheese without farting, you can sleep with my sister."
"I swear to cow!"
Sheldon: “You don’t screw the Roommate Agreement, the Roommate Agreement screws you!”
Sheldon: “I am aware of the way humans usually reproduce which is messy, unsanitary and based on living next to you for three years, involves loud and unnecessary appeals to a deity.”
Penny: “Oh, God!”
Sheldon: “Yes, exactly.”
Sheldon: “All I need is a healthy ovum and I can grow my own Leonard Nimoy!”
Penny: “…I’m only giving you the napkin, Sheldon.”
So what are your favourite quotes from The Big Bang Theory across all series?