loop
(Two isn't-my-child-cute entries out of the last three. Sorry. I promise that the next will be something else.)
So, anyway, Heather was counting for some reason or other, and she went: one, two, ..., twelve, thirteen, fourteen, sixteen, sixteen, sixteen, sixteen, sixteen ...
Presumably a broken linked-list pointer triggered by overflowing a 4-bit counter somewhere.
I don't know how you reboot a toddler.