In a case of truly terrible timing, Collider can confirm there's a Green Book reunion on the horizon, as Viggo Mortensen is in negotiations for a key supporting role in director Peter Farrelly's next film, which is being referred to as The Greatest Beer Run Ever. No, this isn't some stupid new Farrelly brothers comedy. This Skydance project was already announced, and the story is actually pretty cool. It tells the true story of John "Chickie" Donohue, who traveled from New York to Vietnam in 1967 just to share a few beers with his childhood buddies, who …