Like most babies, Teddy thinks knocking over block towers is the best thing ever. As soon as he sees one of us building something he starts giggling and crawling over. He knocks them down in seconds.
He's stacked two blocks on top off each other a number of times, which kind of impressed me.
I think my favorite is when he picks up a block and it looks like he's going to try to stack it on a tall tower. Nope, he's just using it to bash them all down.