The video is awesome!

Dipper's  POV  

  There had to be a way to undo the deal I had made. I could see that something was wrong. I may not be able to be in control, but I could see  snipets of things that were happening. Bill would destroy everything if I didn't  step up. I tried my best to think of a way out... that's when I remembered something I had learned in the mindscape.  I could do anything in my mind. After all I owned this place. If I could do anything, could I basically have enough power to defeat Bill? 

  He was a dream demon so his power and weakness was the mind. Of course! I could find the memory of us making the deal and maybe create a way out. A loophole. It seemed pretty clever. Could I outwit Bill? It was worth a shot. Ever since I had told myself I wasn't crazy, my mind had gotten semi  back in order. I thought about that moment when I practically lost my life. I heard the familiar words we had said. I opened my eyes to see the memory of the deal. I was about to medel  with it when I noticed something next to it. 

  It was  a  piece  of  paper  that looked pretty formal. I picked it up, and saw it was a contract form of our deal. It said, that if I gave up the body of my worst enemy, (AKA me) to Bill, then he would show me the secrets  of  Gravity  Falls. It was signed by me, and Bill. Wow, how nice. Maybe I could imagine something else in to contract. I smiled at my plan and began to watch it as more words burned into the contract. 

  "The person who makes the  deal with Bill can call it off whenever he wants." I thought for a moment and thought about what could save us all. "And once he calls it off, then he gets a moment of power to do whatever he wants." There. It was complete. "Now I just have to get Bill back in my head so I can confront him." I said. I began to fight my way back into control. It was hard to break through the veil of the mindscape, Bill was becoming more attached to his new body. I could almost make it... I had to.