A computer game becomes a little too interactive for Jiggy McCue and buds in this all-out, innuendo-laden farce. Jiggy and neighbor Angie discover the down side of playing “Toilet of Life” on the Web when they wake the next morning with switched bodies. No need to imagine the possibilities for comedy, Lawrence (The Killer Underpants, p. 503, etc.) covers most of them, putting Jiggy-as-Angie through a range of indignities, including having to face spinach lasagna (Angie’s favorite), and the unwanted attentions of classmate Ralph “Eejit” Atkins. Angie-as-Jiggy gets not only a “free extra attachment” to cope with, but a new hormonal mix that amplifies the effects of her already-bad temper. With no opportunity for pranks or double entendres lost, this will have readers rolling on the floor from Jiggy’s opening discovery of a mountainous facial pimple (“ . . . the one bright spot of my day”) to the final twist, in which Angie and Jiggy recover their own corpora, only to discover that Angie’s stepbrother Pete has switched with aptly named Stallone the cat. Fans of Mary Rodgers’s Freaky Friday (1972) and Summer Switch (1982), as well as readers who find those classics a bit creaky in the joints, won’t be able to put this down. (Fiction. 12-15)