It starts innocently enough: a simple thought experiment, a clever idea, a witty remark. But soon enough, you're so deep in your own head that you forget what you're thinking about in the first place.
Meet Bob, who spent 4 hours contemplating the meaning of life. He wrote 17 pages of notes, but forgot to eat his lunch. And his cat.
Meet Jane, who thought she had an idea, but actually just stared at a wall for 5 hours. Her cat thought it was just another staring contest, though.