BEEN THERE, DONE THAT. Eliciting chuckles galore, the short stories in "Mischief: A Collection of Juvenile High-Jinx" will renew your appreciation for the impulsive creativity of yesterday's youth. Based on author Stephen W. Wasz's childhood escapades, these tales of adolescent tomfoolery in sophisticated and unsuspecting suburban Piedmont California and then suburban Chicago may stir up similar memories from your own past. After all, what inquisitive little boy could resist the temptation to lob mud balls down his backyard and watch them explode on the neighbor's enticingly pristine beige...