Second Hand Car

"Whose car is this?" "Mine! I just picked it up from the car dealer. You like it?" "It's great, congratulations!" "Thanks, but it's just a second hand one. Would you like to take it for a spin?" "Really? You don't mind?" "Not at all." Five Minutes Later- "What'd going on? I thought you were taking the car for a spin? "Just give me a minute. I'm just trying to decide something." "What?" "Well, you said it's a second hand car, but I just can't decide which is my first hand and which is the second?"