Having given his inexperienced friend the lousy blackjack advice to ‘always double down on 11,’ Vince Vaughan (second from left) tries to console Jon Favreau (center) after his inevitable loss in the 1996 movie “Swingers.” (Image: Youtube) “This is a very common issue with blackjack players,” Anthony F. Lucas, a professor of casino management at UNLV and former gaming industry operations analyst, told Casino.org.