On the move soon?

Yesterday afternoon Jacob didn't want to take a nap. He wasn't fussy in his crib - he just talked and laughed and made various noises until I decided to get him up after an hour of him being in his crib.

While we were playing in the living room a few minutes later, this is what happened.....

Should I be excited or scared that he is almost crawling??

(Note: I included another minute or so of video after the "hands & knees" episode just so you could get a glimpse of Jacob's cuteness right now. I just love being with him everyday!)