Thomas is kind of a serious kid.
In that he will smile all the time for Mommy, but whenever anyone else enters the room he has to stare them down for about a half hour before a trace of a smile will cross his lips.
And he almost never giggles.
Every once in a while, if you catch him just before nap time and do something really crazy, you can get a few giggles, like this:
Way to go, Daddy.