"The Two-Headed Boy of Bengal" In 1783, a boy was born with two heads. The second head was fully functional. The boy claimed he could hear the other brain telling him things.
While the second head was rarely conscious, it did act independently from the other at times.
When the child laughed or cried, the second head sometimes didn’t match the action. If the first head was asleep, the eyes on the second head darted around as if observing its surroundings. But the heads also acted in unison in some instances
Interestingly, when the boy was fed through the first head, the tongue on his second face would salivate. Witnesses also say that the second head would instinctively suckle when presented with a breast.