Hanged to dry

Two mental patients were walking next to a swimming pool. One jumped into the pool and the other jumped in to save him. Their doctor saw the rescue and called the rescuer to his office.
- Due to your actions, it appears your mental state is fine, the doctor said to the patient:
- You can go home to your family, but before you do, you should know that the person you saved hung himself today. The patient replied:
- He didn't hang himself. I hung him there to dry.