Click here to find out what 'bugger' means.
New Zealand commercial using the "mate" theme to combat drink driving. Tag-line: if you drink then drive, you're a bloody idiot.
He's calling the guy by his name (Dave) rather than mate because they're not mates anymore after the crash. "Mate" is a pretty common term when you're speaking to someone. It's actually more common than using a person's name a lot of the time so to go from "mate" to "Dave" shows how far he's been separated from his friends. He's not one of them anymore. He's just someone who killed their real mate.
A hilarious commercial from New Zealand that explains when togs (the kiwi word for swimsuits) begin to be considered undies (underwear).