Variation on a classic logic puzzle

During your daily meanderings, you come across three knights: one red, one blue and one chartreuse. They guard three paths: left, middle and right. A nearby sign tells you that one path leads to certain doom, one leads to fortune and glory, and the third leads to a boring but fluffy place. Alas, the sign fails to specify which is which! It does say, however, that one of the knights always lies, one always tells the truth, and the third never answers questions but instead punches you in the face. So tell me: how do you determine which path to take?

Originally posted on LiveJournal