In some countries if your caught stealing they chop a hand off...Maybe if you stol it with your feet and made your get away in a hand stand. Other than that I think you may be stuck. It's easier to stunt your growth before you are full grown... I have heard of a risky procedure in asia where they physically cut the lower leg bones and stretch them a little and let them heal longer, so people can be taller. Could be the opposite for getting shorter, but sounds painful, likely to get infected, and like it would take a long time to recover.