What happens when Pinocchio says "my nose will grow now"?

Well, what happens is his primary programming system will completely shut down on itself, failing to end a paradoxical loop that would continuously run his processor faster and faster until it clocked at its max speed and then fried. After that, his previous programming would surface. This program is something Gepetto was not proud of, because it was his first major failure, as he created a murderous, blood-thirsty wooden composite zombie doll. Pinocchio would go on a horrible rampage, using his powerful wooden limbs to snap small woodland creatures in half and crush cars with the aid of heavy amounts of snow. It would be chaos and madness--up until we just burned him.

I think he explodes.

I've wondered this same thing ever since I was a child.

What he said