Big Bang Theory Quote
Sheldon: I spent so much of my childhood at that hospital. When I was 12, I got to ride there in a helicopter.
Stephanie: Why, w-w-what happened?
Sheldon: Radiation burns. A little mishap while I was building my own cat scanner.
Stephanie: I'm sorry, you tried to build your own cat scanner?
Sheldon: No, I didn't try, I succeeded. In fact, I was briefly able to see the inside of my sister's guinea pig, Snowball, before he caught fire. It led to an interesting expression in our house: "Not a snowball's chance in a cat scanner."
Quote from S02E09 - The White Asparagus Triangulation