Laughter

I think this man:

Had a grandchild:

Update: A ha! Jake reminds me of my commitment to disclosure. The top video is of... largely unknown provenance. It was sent to me this morning by my friend Sommer, who has a penchant for sending friends peculiar, and sometimes disturbing YouTube clips. This one just happened to remind me of the baby laughter video, which I saw months ago, and which is one of the most widely viewed in Internet history.