If a creator of a Shield Guardian gives the control amulet to the Shield Guardian, what would happen?

There was an idea pitched at one of my play sessions earlier this week that has been gnawing at me. Suppose a wizard creates a shield guardian and gives the golem the telepathic command to take off the amulet and live a life of its own; what would happen?

Would the Shield Guardian become a sort of pseudo-warforged, following the original command? Would it just be stuck, standing there?