My Hairiest Adventure is the 26th book in the original Goosebumps series.
The cover illustration features Larry looking at the mirror in the bathroom, noticing his arms and parts of his face covered with blackish hair.
Synopsis[]
Larry Boyd just found the coolest thing in the trash. It's an old bottle of INSTA-TAN. "Rub on a dark suntan in minutes"-- that's what the label says. So Larry and his friends do. But nothing much happens. Until Larry notices the hair. Dark, spikey [sic] hair growing on his hands and face. Really gross shiny hair. Hair that keeps growing back even after he shaves it off...
