It takes a long time to become Dale Hansen, 30 years in fact. That's how long the bombastic, wisecracking dean of Dallas sportscasters has been doing his shtick at WFAA Channel 8, a career that has produced a million one-liners, like his description of Mark Cuban as Son of Frankenstein: "If he just had a couple of bolts stuck in his neck, you couldn't tell 'em apart." But every once in a while he slips and reveals a mordant serious side beneath that amusing surface, like two years ago when he tongue-lashed his own station for airing a surreptitious ambush video of one of his frequent sparring partners, Cowboys owner Jerry Jones, acting the fool in a bar. Who can get away with that? Dale Hansen. That's pretty much the list.