Sense of Urgency

Recently, a long line wrapped around a corner inside a Las Vegas hotel. Upon closer inspection I discovered that people were not waiting to go into a show... or a restaraunt... They were lined up to buy freshly baked donuts.

I passed by that donut shop several times over the next few days, and discovered that the only time there was a line... was when the "Hot Doughnuts Now" sign was lit. They had a product combined with a marketing tactic that created a sense of urgency in their customers.

What are you doing or saying to get your customers to buy NOW rather than later?