Old Guy fools everyone, especially me

On the first day of the Main Event, there's one old guy at our table who doesn't seem to have a chance. He's got a hat on commemorating the 60th anniversary of some World War II battle in 2004. He can't see the cards ("Is that a queen?" he asks after the dealer puts a King out there), has to be reminded to hold his cards so his neighbors can't see them, and falls asleep twice in the first two hours of play. He's got a very passive style, always calling and never raising. I'm quite confident he won't even make the dinner break, but somehow he does.

After dinner, though, it's a whole different story. Now he's raising, re-raising, seemingly making some astute folds. In the span of about forty-five minutes he takes down about 5 big pots without ever having to show his cards. We're all wondering what the heck he has and when someone finally calls him he's got a monster full house! He not only makes it all the way through day one but torments our one legitimate internet star with a re-re-reraise to take a big pot from him.