Sheldon: At my age do you know how I'm statistically most likely to die?
Leonard: At the hands of your roommate?
Sheldon: An accident.
Leonard: That's how I'm going to make it look.
Penny: Honey, have you ever run before?
Sheldon: Certainly. I've run from dogs, bullies, angry chickens, and one persistent PE teacher determined to bend me over and give me a scoliosis test.
Penny: You wanna turn yourself into some kind of robot?
Sheldon: Essentially, yes.
Penny: Okay, here's my question: didn't you already do that?