Bush give the Press the Middle Finger (or thumb?)

LINK to video

From Press Briefing with Scott McClellan:

Q Scott, The Washington Post this morning reports that, "Many days, no doubt, he" -- that's you, Scott -- "he harbors his own desires to finger his feelings about reporters." (Laughter.) That's what they reported. And my question is, since The Post also reports that "The President suddenly thrust his right hand into the air and extends a finger." White House officials yesterday said it was his thumb. Could this be interpreted as the traditional thumbs-up signal, or is it a mistake to confuse the President's thumb with his middle finger?
I have a follow up.

MR. McCLELLAN: Les, okay, I found all this kind of preposterous --

Q It was in The Washington Post.

MR. McCLELLAN: -- and the story that was run there. Clearly, if you look at it and if you were there, you would recognize that the President was giving a thumbs-up. Someone in the media had asked something to the effect of, how does it look on the Central American Free Trade Agreement, and the President gave the thumbs-up.
I don't know how someone is trying to divine my inner thoughts, but despite some of the back and forth that we engage in today and other times, even with people like David -- (laughter) -- I have great respect for the job that you all do. And you all -- you all know the way I deal with you all and I know the way the President acts. And that's -- it's just preposterous to make that kind of suggestion.