Bruce Willis turned the air blue at a live basketball game on Sunday (29Apr07) when he called a TV host a "mother f**ker". The Die Hard star was interviewed courtside during the New Jersey Nets' NBA Finals play-off game with the Toronto Raptors and forgot he was live on air. Asked about his upcoming Die Hard sequel, he beamed, "It's unbelievable... It's better than the first movie," and signed off, "Yippee Kay Aye, mother f**ker." Ironically, the outburst comes as Willis insists he's not "naughty" enough for the tabloids in the upcoming issue of Vanity Fair magazine. He says, "They're not writing about guys my age anymore unless I do something naughty."