Heist Ideas?

Another brainstorming session while blazed the other night brought up the topic of a heist with myself and some people I was chillin with. Which brings me to this point. Has anyone else ever actually sat down and thought out the processes that you would need to go through to complete a heist? Now i'm not saying that I ever realistically would ever do anything, but it is fun to think about every possible step and scenario you would take to complete a heist successfully. It could be anything really...