Fire in the Hole

I don't get this. On You Tube today I discovered this "phenomenon" called Fire in the Hole (FitH). Basically, what it consists of is someone pulling up to a drive-thru, ordering a meal, and driving around to the window. Most places will hand you your drink(s) first as they're the easiest and fastest to get ready. The objective of FitH is when the minimum wage fast food employee comes to the window and hands you your food, you yell, "FIRE IN THE HOLE!!" and hit Mr./Ms. Minimum Wage with your drink or milkshake. Just watch the video below. Having worked fast food before, I'm appalled but at the same time I can't help but chuckle at times.