Harvey Keitel as Klever, a knight of woeful countenance, in Star Knight
(photo poached from http://www.badmovieplanet.com/)
Unless I remember wrong, there's a scene in Last Temptation of Christ in which Jesus hallucinates a lion speaking to him in Judas's voice, -- that is, the voice of Harvey Keitel. If I remember right, the lion says something like, "Dontcha recognize me?" at which point it may as well have spoken with the voice of Bert Lahr. Whether that scene actually happens in Scorsese's film or not, the entirety of Keitel's performance in Star Knight is just like that. It's a comedic mystery. Keitel is supposed to sound funny because his character is supposed to be stupid. But his accent and the lines he must utter ("Touch not the most beautiful Alba, damn you, whosoever you may be!" is a highlight) leaves you wondering where the intentional comedy ends and the unintentional begins. When it most certainly is intentional, as when he answers the Green Knight's challenge with, "Are ye talking to me?" it's just appalling. With all due respect to Mr. Keitel, I find his performance more amusing the more I believe that he doesn't really know what he's doing. Yet he reads his lines with such enthusiasm, perhaps with more than he actually shows on screen, that you wonder whether he's achieved some esoteric state of intentionally acting so bad that he's good.