Uh, huh.

Since your car was already in the stall, with the rental agreement hanging from the rear view mirror....I can;t help but wonder what the doofus you talked to would have done if you'd said, "OK, I'll wait until 20 minutes after my flight was supposed to land and see if the print on this agreement magically changes to my original booking rate!"

If they're trying to "game" you, you'd think they would at least put a little more thought into it.