Example: the following chain of mental events, as I was looking at some neat sketch-to-painting examples of Magic cards.
Brain: Neat! Neat! Eh, serviceable. Neat! Ooo. Eh, the sketch was better. Neat!
Body: My arm hurts.
Brain: Suck it up.
Brain: And now, back to the art! Neat! Neat! Hey, let's check the e-mail. Spam! Spam! Neat! Spam! Eh...
Body: My side hurts.
Body: Now my arm AND my side hurts.
Body: Possibly the fact we've been sitting with an opaque projector tucked under our arm for the last half hour?
Brain: Oh, that. I was going to change the bulb so I could work on that painting.
Body: Do you think we could maybe set it down until we're done on the computer? It's hard plastic and it's poking me.
Brain: If we set it down, we have to admit we were fooling on the computer instead of working. The projector stays!