Out of curiosity, you stick your foot in the footprint to see how huge it is compared to yours. But as soon as your foot touches the grass, you get a mild electric shock! You can't get a spark from grass and rubber, so this was quite a mystery. You don't have time to think, however, because you feel a warm, tingling sensation and your shoe suddenly begins tightening around your foot, almost crushing it. With a loud rip, the shoe bursts open, letting your socked foot breathe again. But the tingling didn't stop there.
There was another tearing sound and your foot tore a hole in the sock. And while you were distracted, your other foot did the same, breaking open your shoe and sock in a split second. It was now clear that your feet were indeed growing larger -- and you were the tingle was spreading all over your body! While your feet continued growing steadily, ripping your footwear with every inch, your other muscles were expanding to balance them. At this point, you noticed another strange effect -- thick brown hair spreading over your arms and feet. As the legs of your pants split up the sides from the extra muscle mass, you could see it growing on your legs, too. You have to get away from here, now!
You break into a run, leaving the shreds of your footwear behind. But the sensation of wet, muddy grass on your feet just made the tingling more intense. Soon your hairy barrel chest burst through your favorite shirt, your sleeves were split open by your massive arms, even your fly ripped open to reveal a bulge that stretched your underwear to the limit. You held out hope that the underwear would hold, but the elastic snapped violently and your penis was suddenly out in the open. The rush of embarrassment was enough to make the tingling worse, and you were forced to your knees for the rest of the transformation.
You finally feel your face warping and changing to match the rest of you, growing thick fur and stretching into an apelike appearance, only with large, threatening fangs. The shredded remains of your clothes were finally finished off by your growing chest and hips, although a thick coat of fur now covered almost every inch of you. The transformation finally seemed to slow down at this point, but not before your hairy feet grew two or three more sizes, guaranteeing you would never wear shoes again. With the tingling sensation fading and your mind still fuzzy from the pain... you promptly collapse in the grass for an unintended nap.