John and Edna were both patients in a mental hospital.

One day while they were walking past the hospital swimming pool, John suddenly
jumped into the deep end. He sank to the bottom of the pool and stayed there.

Edna promptly jumped in to save him. She swam to the bottom and pulled John out.

When the Head Nurse Director became aware of Edna's heroic act she immediately
ordered her to be discharged from the hospital, as she now considered her to be
mentally stable.

When she went to tell Edna the news she said, "Edna, I have good news and bad
news. The good news is you're being discharged; since you were able to
rationally respond to a crisis by jumping in and saving the life of another
patient, I have concluded that your act displays sound mindedness.

"The bad news is, John, the patient you saved, hung himself right after you
saved him with his bathrobe belt in the bathroom. I am so sorry, but he's dead.

Edna replied "He didn't hang himself, I put him there to dry. How soon can I go
home?"