Stupidity In Reverse

(I am working as a manager at a pizza store late at night, with just the delivery driver and myself working. The driver is out on delivery so I am on my own. I have a few orders to be picked up and I am walking out back when I see there is a car in the drive-thru.)

Customer: “Seriously, I have been waiting for ages; what took you so long?!”

Me: “Oh, my goodness! Sir, I didn’t know you were there! I didn’t hear the alarm go off.”

Customer: “Oh, I reversed in.”