The tendency of some "geniuses" to tell people of their master plan to destroy them before actually doing it. This usually results in the plan being foiled and said "evil mastermind" getting their comeuppance.
When you become so zooted (stoned) that you begin talk to yourself in the third person, while often creating imaginary people to have hypothetical conversations with. Essentially, you are having a conversation with multiple people that are within your mind discussing hypothetical situations that are often ridiculous and far-fetching.
Jay Leno might as well have a dialogue, since his band leader always laughs at the jokes that bomb and then continues to talk to Jay to make up forthe silence afterwards