Where's he get this stuff?

The other night I asked Kian a question as we were laying in his bed reading books. I really can't remember the question unfortunately. But, his reply?
"Pwobaby, mommy, pwobaby".

Last night I was cleaning up the kitchen and he came running up the stairs to where I was, at the same time the cat jumped off the counter and ran in his path to get to the living room. They kind of bumped each other and both kept on going. He stopped and laughed and thought it was the funniest thing. He went into Kevin and tells him "I ca-wided with Ace!"
I said "you what?"
"Ca-wided. I cawided with Ace." more laughter.
"Kevin, did he just tell us he collided with the cat?"
Yep. I don't use that word much at all, I would have said "ran into" or something. Never ceases to amaze me.