Okay, Nate hit his most important milestone ever - he laughed independently on something that happened on TV. I hadn't laughed, and there was no laugh track - he saw something happen and found it funny.
Okay, here's the best part: he laughed at a guy falling down. The oldest funny thing in the world - a guy falling down. In this case, actually, it was three Backyardigans falling down, one after another, while ice skating. He grinned at the first one falling down, grinned at the second one falling down, and then squealed with laughter once the third one hit the dust.
It was amazing.