You'd have to guess that, if you had flippers like this, you'd be a great swimmer. And you'd be right as these are the feet of world champ swimmer Ian Thorpe, an Aussie.
They're size 17.5 (American; 17 European).
But last January that caused a ruckus of some sort - not around here, but - apparently a TV reporter in Australia wondered jokingly whether, if he's got big feet, he's big elsewhere as well. The guy didn't like that much, and made a fuss about it, and the reporter wound up getting fired.
So apparently the answer to her question is yes; he's also got a massively overinflated sense of importance. And a sadly shrunken sense of humor.