Movies
Wait a minute! Wait. Wait. I'm having a thought. Oh yes. Oh yes. I'm going to have a thought. It's coming. It's coming. ...It's gone.
— Big Boy Caprice ‧ Dick Tracy

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
A comic bit of stalled thinking: the speaker announces a thought is about to arrive, builds up excitement, then loses it. The humor is the buildup followed by nothing, with the speaker as the unwitting butt of the joke.
Context reviewed