There are better ways to deal with this than calling 911. You can always enter the establishment and tell them they shorted you a burger. It sounds like this guy did that and then decided to call 911 like a fool.
If I would have been in his shoes, I would have remained calm and got the name of the person that refused me the burger and called corporate the next day. This way works much better than calling 911, and someone (not you) is bound to get their ass chewed in the process. Don't ya love it?
kneifl