You decide you want the mouse balloon. No particular reason, just that it seemed pretty cute.
You walk off, string tied to your wrist, but feel slightly odd.
You lean against the wall, taking deep breaths, and suddenly notice your hands; they are a white latex, and seem to be... filled with air! Your face suddenly expands outwards, turning into an inflated muzzle, and two pointy teeth protrude out of the end.
A man in uniform points at you, and suddenly pulls out a net!
You...