For those that are worried, I do not pull on the arms, he does this entirely by himself.
Well tonight he decided to mess with my head.
He started waving wildly, so I took his hands.
He pulled himself up (what seemed to be) very quickly. So quickly that I was convinced he was going overbalance and fall forwards.
Instead, as he rolled past his center of balance He stretched his legs.
That's right.. he went from a laying position through a sitting position and stood up.
Now he can't sit or stand fully on his own. But watching him rise to his feet assisted, knowing that it was his decision to get to his feet was amazing. And just a little bit terrifying.
P.S. I wrote this as I was dozing off. interestingly, every-time I nodded off, I kept typing what was at the edge of my brain. I've had to delete at least 5 lines of subconscious drivel.