A good example of no control is addiction. A person can do something that they're addictied to, while their rational brain is yelling "no! no! no!" at the same

A good example of no control is addiction. A person can do something that they're addictied to, while their rational brain is yelling "no! no! no!" at the same time, perhaps even vocalizing it, but you still perform the addictive action. The more clever individuals may overcome this by planning their defense way ahead, e.g. by completely changing their environment or using other tricks to manipulate their more automatic brain parts. However most people seem to need external help with overcoming addiction, even if they're aware of the problem and want to solve it.