Frames of Reference

Overheard in the school bookstore:
Girl: What's the difference between these two iPod cases?
Sales guy: Well, this one's like an Aston Martin and this one's like a Mercedes Benz.
Girl: I… I don't know what that means.
Sales guy: Well, which one would you rather drive?
Girl: I don't care… I drive a Honda.

Seen on Discovery channel documentary:
"…it weighs seventy-five times as much as The Statue of Liberty."