You push ahead, examining the rows of enhancement drugs, many of which you've always wanted to try but never wanted to afford. Not seeing a price, you drop a few bottles of pills in the cart, hoping they won't cost you too much.
As you round a corner, you notice a small table with a few cups of a dark, syrupy substance on it. A sign reads "Free Samples, take one." Not being one to pass up samples, you swallow one and continue seeking a way out. Besides, you could always use some extra vitamins in your diet.
You can feel your heart pounding in your chest now, you must be more nervous about being trapped than you thought, and you can feel a lump starting to form in your throat. Wait a second, that's not a lump, you're being strangled by your shirt! You look down at yourself in awe to see your chest mounding in front of you, straining the buttons of your shirt, your sleeves rolled up by your massive biceps. Buttons start flying off in sequence, revealing a deep cleft between your pecs. Your shirt drops to the floor, your widening lats ripping it along the back, and your expanding arms taking care of the rest, revealing your gigantic V-shaped body, and your 8 pack of abs.
A deep ripping noise reminds you that not everything is taking place in your upper body, and you look down to see your pants explode to shreds, your thighs swelling larger than your waist, and your calves to what your thighs used to measure. Without the restraint of your cloths, the speed of growth seems to double, then triple, your body exploding with size and mass. With sweat running down your face you look up into the security mirror and see a horribly disfigured version of your old self. Basketball sized biceps rise on top of your monsterous arms, your chest so huge you can hardly see over it. You strike a few poses in the mirror, and then grab a pair of posing shorts from a shelf, hoping they won't cost you. Highly distracted, you glance the shelves over again, wondering what else these drugs might have in store for you.