Wandering through the aisles, you eventually come across a cute plastic cat muzzle of sorts. Made of a white plastic and with a little pink nose, it looks like it's designed to fit over your nose and upper lip. It's not exactly what you'd call impressive, though words like "cheap" and "crap" come to mind. Oh well, the thing's free anyways.
Odds enough, you find that there's no string to tie the muzzle (or half-muzzle, or nose, or whatever the heck you want to call it) to your face. Maybe it uses suction? You hold it up to your face for a moment, but it doesn't feel like it's sticking at all. You try pushing it on harder, but it doesn't help. However, contact with that nose feels like its brought on some mild swelling in your upper lip. You pull it away from your face, but the swelling only seems to worsen. Damn! You must be allergic to something in that cheap plastic!
Searching desperately for something to wash off whatever's making your face swell, you eventually find the shop's bathroom. Without wasting a second, you pour water into your hands and rub it into your face... wow, that swelling is worse than you thought. Looking up at the bathroom mirror to survey the damage, you're immediately shocked beyond words when you see that your lip hasn't simply swollen but has disappeared altogether. In its place is the white-furred upper muzzle of a cat, whiskers extending idly outwards and dotted with the cute little pink thing that is now your nose.