"I Saw the Whole Thing" questions...

[spoiler] I just watched this episode (for the second time) and at the very end John Forsythe explains why he couldn't answer the direct question of whether he did indeed go through the stop sign by telling his friend that he didn't want to commit perjury--but if he had said that no he did not go through the stop sign technically he would have been telling the truth since of course he was never in the car in the first place. So I don't really understand how he comes up with the perjury angle. Plus, it was a little funny that he was worrying about a perjury charge when the whole scheme he was engaged in vis-à-vis the court in the first place would have gotten him in some pretty hot legal water I suspect...