"Ms. Apple," you say in your childish voice. "I have to go to the bathroom."
She gives you permission and you run out of the room. You go down the hallway into the bathroom, but you don't make it to the toilet in time. A big lump of poop sits in your pants.
"Aw man!" you think. Then you feel a change. You're clothes absord into your skin, leaving you naked. Then, your skin gets all brown and soft. Soon, you realize you're swelling up. Smelling yourself, you realize that you've become a life-size piece a poop!
"Oh no!" you think. "I guess a side effect of the change was turning into poop if I poop in my pants."
Since you have no arms of legs, you slither across the bathroom, going out the door.