As the tingling began to spread across his toes and beneath his heels, his socks began to grow snug. The material began to stretch, and creak as his digits swelled with a vigor he'd never have believe was humanly possible. A creak, and a rip were heard, as his digits began to occupy every conceivable space the sheer fabric could allow, before it faced no other choice, but to buckle beneath the force of the now marsupial like toes swelling to exponential dimensions. Bert could only look on in horror, as more and more fur began to rise from his collar, and towards his cheeks, circling his features with a tan downy fuzz.