Shoot, I stepped on a crack, gotta step on another one of the exact same size and type in the exact same spot with my other foot. Scratching my right ear, gotta scratch my left one too. Can’t stop washing my hands! Must push all four arrow keys the same number of times. The papers must be perfectly aligned, even if it means tapping them a hundred times. I’ll count. Now I have to make that speck of dust pass through the exact center of my vision several times, back and forth, very quickly blinking at the exact moment it passes through the center. Dang! Missed. Dang! Missed. Dang! Missed. Dang! Didn’t time the blink right. Have to start over.