In an interview on israeli TV yesterday he was saying how PA will do their best effords not to allow israeli soldiers be fired on by palestinains during the pullout operation, when one of the interviers asks him "Really??!", with this special jewich intonation.
So Saeb Erekat (not unaware of his reputation in Israel, I suppose, "Jenin massacre" deception and so) says "Tonight I don't feel like lying".