"Hey, how dangerous could ants possibly be? At worst they'll sting a little" you think, and so you head into the Venomous Ants terrarium. You watch entire colonies of ants crawl across the floor...then notice they're crawling up your leg! You freak out and try to shake them off, only resulting in lots of stings. "Ow! Little bastards!" you grumble. You quickly make your way back out of the terrarium even though the exit door is on the other side of the room. Your body seems to have darkened a bit, but you think it's just the light. But it just keeps getting darker and darker until it turns a deep black. You wonder what the hell's going on, especially since two long things are extending themselves from your sides...suddenly, they rip through your shirt and discover it's another pair of arms! Your hands have started turning into very simple claw-like things, as have your feet and thus you no longer have need for shoes. You now have three pairs of identical limbs, ending in ant appendages.
You take off your shirt and see that your torso has started forming a separate section of your body, your flesh turning into chitinous armor. Your jaws push themselves through your mouth, bending into claw-like face extensions, as the rest of your head inflates and smooths into an ant head with your huge shiny black eyes on the sides of your head. Finally, your pants expand in size in the rear until a huge bulbous mass rips through the back, which you know to be your abdomen. This has almost doubled your body size, and you wonder why you're so huge, but you refocus your attention to getting out of here...