In 'The Dilemma,' Vince Vaughn discovers that his best friend's wife (Winona Ryder) is cheating on him and sets out to prove it.

But his plan isn't without a few bumps in the road -- and on the face. In this exclusive clip, which aired tonight at the People's Choice Awards, Vaughn rolls into some nasty foliage after seeing the adulterous couple kiss, resulting in some pretty bad side effects.