Nothing quite focuses the attention like a toothache. Invisible to others, it comes to dominate one's life with its single-minded insistence on being attended to.
Other wounds to the flesh can accomplish the same sort of focus, but only for a while. Usually one can eat and drink and read or watch TV to distract oneself, but a toothache is in a class by itself. Eating and drinking become problematic, and distraction becomes nearly impossible. Read more >> about Amblin' Alameda: Toothache