By: Addison Wylie For the past month, intrepid comedic actor Will Arnett has been promoting the bejesus out of his latest flick Teenage Mutant Ninja Turtles, a hyperactive reboot of the original heroes in a half shell.  He fearlessly sells his character (news cameraman Vernon Fenwick), the action sequences, and the New York City setting with utmost grit and spirited enthusiasm.  If Tommy Boy’s Tom Callahan could sell a ketchup popsicle to a woman in…