Brian Miller spent 20 years in Boston selling computers. Sometimes, he stopped in at the Cape Cod Emack and Bolio's for a couple of scoops of Twisted Dee-Light and Deep Purple Cow. Then he moved to Boca to open an ice cream store of his own -- every nerd's fantasy. Emack and Bolio's started out 30 years ago as a late-night hangout for rock 'n' roll types; it was owned by entertainment lawyer Bob Rook (hence the ice creams nostalgically named for '70s and '80s bands). Today, there's plenty to keep the tykes occupied (like 100 flavors), but a new line of milkshakes, glad to say, is for grownups. They're called "frappes" these days, of course -- gotta change with the times -- and five flavors ($5 each) are designed to keep you up all night bangin' head to your old Twisted Sister discs. Choose from Irish Coffee, Italian Coffee, Dirty Monkey, Caramel Thriller, and Nutty Monk, all made with ice cream, a good splash of French roast coffee, a dash of the appropriate flavoring, and a cap of homemade whipped cream. Miller says he's adjusting just fine to the life of an ice cream man -- long "hours of boredom punctuated by moments of panic." Sounds kinda like the way we remember those old Deep Purple records. "Smoke on the Water," anyone?