Howard: Then why don't you ever drive yourself?
Sheldon: Honestly, I barely passed my test. And the one time I drove on my own, I made a U-turn, got dizzy, threw up and walked home.
Howard: You really want to drive?
Sheldon: It seems like the perfect time. The roads are straight, there's no one around, and you don't seem to care if you live or die.
Howard: Live, Sheldon. I want to live.
Sheldon: That makes things a little trickier, but I'll do my best.