It's the fastest shoe in the world, supposedly, so those who buy it should have the same need for speed. Agency Circus and Puma Mexico created this new twist on the shopping spree. When customers entered the store, a Usain Bolt cutout spit out a ticket with a time on it, and as they cashed out, they got another ticket. The faster you bought, the higher discount you got -- three minutes got you 20% off, while 10 minutes got you 5%, and so on. It's a nice way to create a bit of a buzz during shoe shopping, but we hope those customers actually tried the shoes on for size, or else there are going to be returns galore.