The Equus Pinkiensis. A fascinating creature that is the bane of party organizers everywhere, in which said creature gallops towards anywhere with the smell of pastry (which it messily attempts to devour) and balloons; and the noise of cheers, laughter, and party horns.
 
It is, furthermore, a noisy creature that never wants to be alone, or it will wander and roll around, and whinny and nicker to itself and some objects it considers as its toys.
 
Furthermore, it will sometimes attempt to make you do a “Pinkie Promise”, in which failure will mean that this horse will attack you with bites, kicks, or pastry, whenever you go near it or it smells you.
 
Or this may be just an ordinary horse, painted in pinkish colors, having no idea on what it should do, or why is it here.