James Sully,
An Essay on Laughter: Its Forms…
“ Tickling is clearly only a special modification of the teasing impulse. In some of the earliest nursery play, the game of bo-peep, for instance, there is an element of teasing in the pretence to alarm by a feigned disappearance, as also in the shock of the sudden reappearance. The teaser of a child, whether he threatens to pinch him or to snatch at his toy, carries out a menace; but it is a make-believe menace—a thing to be a wee bit afraid of for just a moment, yet so light and passing as to bring instantly the delightful rebound of disillusion, if only the subject keeps good tempered. ”
