Board Thread:General Discussion/@comment-7194591-20130904083855/@comment-25294282-20141013022907

What interests me is the fact that Bill Cipher seems to not be bound to his deals in any way. He made a deal with Dipper and then immediately destroyed the laptop that he had promised to help unlock.

I don't think his deal with Gideon is significant. It was probably something that involved getting rid of evidence of the secrets of Gravity Falls.