Get down on the ground right now. >> Video shows a man who allegedly stole a Publix shopping cart, then patrols the beach, thinking he owns it, acting like a cop. >> I noticed you're out with a public shopping cart right now pushing it around. >> I own Publix. >> You own Publix? >> I do. >> Oh, okay. >> You own most of Cocoa Beach. >> Okay. Let me see your driver's license, please. >> I don't have to show you anything. >> After refusing to show ID, he started saying he's the cop. >> I'm a cop. >> Okay. >> And thought he could just walk away. >> You're not allowed to walk away. >> What are you going to do about it? You going to taste something? >> Get down on the ground right now. >> Get down on your knees right now. >> Absolutely not.