Well, now that Derek is not only crawling, but trying to pull himself up on anything and everything, he keeps getting himself into some interesting and rather precarious positions.   Most of these positions, he doesn't have the skill to escape from yet, and so he gets a little mad.  They make for some really great pictures though :).   

In this first one, I was in the kitchen, and he got really quiet.  This is how I found him.  He reminded me of an auto mechanic.   This last picture, he was up on his knees and trying to climb up the couch, but he kept slipping.  And, being the terrible mom I am, I stopped to take a picture instead of helping him.  Poor guy.  No wonder he was mad :).