lol:
The only thing I can think of is this guy must have realized just as the shutter snapped that these were going to be posted to the web and his wife/girlfriend might see it. It is the only explanation for why he doesn't have the huge cheesing grin that you see in every other pic.
BTW, have no idea who this is, but the pic made me laugh since he has a hot babe on his arm but isn't smiling.