WHO cares if the Loch Ness monster is real, we now know the true identity of Mr. Six, the rubber-legged dancing old guy from the Six Flags amusement parks ads. He's really Danny Teeson, in his late 20s or early 30s and one of the stars of Bravo's "Queer Eye for the Straight Girl" the spin-off of "Queer Eye for the Straight Guy." The news was broken first on an Internet blog last week, pauldavidson.net, and confirmed to The Post by knowledgeable industry sources. It is understood that Teeson's ad campaign is over, but Six Flags officials have insisted that...