Mental Health

Bob and Stan were in a mental institution. This place had an annual contest, picking two of the well behaved patients and giving them two questions to test their mental health.
If they answered correctly, they were deemed cured and free to go.
Bob was called into the doctor's office first to test his mental health.
'Bob, what would happen if I poked out one of your eyes?' asked the doctor.
'I would be half blind,' replied Bob.
'That's correct. What would happen if I poked out both your eyes?'
'I would be completely blind.'
The doctor shook his hand and told him he was free.
On his way out, meanwhile the doctor filled out the paperwork, Bob told Stan the answers.
The doctor went through the formalities and then invited Stan to test his mental health.
'What would happen if I cut off one of your ears?'
'I would d be half blind,' replied Stan.
'Oh... What would happen if I cut off both your ears?' asked the puzzled doctor.
'I would be completely blind,' replied Stan.
'Stan, how can you explain that you'd be blind?' asked the suspicious doctor.
'Well, my hat would fall over my eyes,' replied Stan.