I had diapers on the book shelf, and he yanked them down. I put them back, and he pulled them back. He thought he was so funny! After about 10 times of this... I removed everything from that shelf. :)
His next accomplishment will be pulling himself up on something. He's currently plotting how he will pull himself up on his jumperoo. He stares and grabs at it while he's on the floor.
He also loves to clap and sit up while he plays. Such a big boy!