This is the look Jack gives me when he tries some new "trick" that he thinks he probably shouldn't do. It's hilarious. He usually accompanies the look with a slight grin. He's really into climbing on anything and walking up and down (and up and down and up and down and up and down) stairs. Another new thing is when I go in to get him in the morning or after a nap, he doesn't want to come out of his crib for quite a while. He likes to walk around in it, throw Bob out, and then point at him on the floor and grunt until I pick Bob up and give him back. He actually had a back-arching fit this morning when I took him out of his crib. F-U-N. For everyone.
Here's a couple videos of some of Jack's latest tricks: