Erm.... From Dusk til Dawn. Have Clooney or Tarantino ever actually won oscars for directing?! Hmmm doubt it. Darn it! That'll keep me up now BagPuss! Good question.
Whilst i work this out (and i will !!!!!) Robert Redford, Clint Eastwood, Mel Gibson, Woody Allen, Richard Attenborough and Kevin Costner are the actor / best directors (and Ron howard but unless they made a Happy days movie i dont think it was him.)