"Hey you, yea you there fuck head! You stupid Genie, you think that with all your powers and abilities one such as you could get everything right! If it were left up to me now I'd......................oops!" you blurt out in disgust and surprise.
The glint of that Genie's evil eye does the trick and he vents his powers over you.
In bright flash of light your shrunk in height and stand now only 31 inches above the ground, as measured by the height of one's withers.
"Don't mess with a Genie Mister Wizard! You can change people to equine animals now and a few other neat tricks but to anyone looking at you, your just a nice fuzzy Shetland pony. Oh and by the by your magic wand is also your pony cock!" chides the Genie as with a wave of his hand he turns to stinky orange smoke and finds his glorious bottle.
A small whinny and two snorts later you think of someone who deserves to be a pony too, as then your wand becomes erect.