Granted.
Your body painfully morphs into that of a monkey. Bones break and reset, shrinking and expanding to fit your new form. Your hair thickens and grows uncontrollably. A tail erupts from your spine. The pain of being torn apart from the inside and reformed is maddening.
Shortly thereafter, your hands and feet are severed by a large man with a butcher's cleaver. They are hung up to be dried. A remnant of your still human brain curses anyone who would make a wish on your paws.
And now you know why the wishes always bring misfortune. The irony strikes you as the rest of you is thrown into the trash.