You can't get them laughing this hard by tickling them, but get a little rowdy and you are on to something.
And look who else has a big smile on his face! This is the "get the green hat," game.
These guys are actually not bad at ducking an incoming "friend"
I think, no I'm positive girls grow out of this. Dads, however just use it as an excuse to act crazy at any given part of the day: like total animals. There's something primal about it that I don't get. All I know, is that my boys love it, crave and in the end really benefit from it. It's the love language of little boys with their fathers. And although I am still finding ways to cope with the anxiety it causes me for all of their safety, they need it, ALL of them.