Nathan: now Stop talking and take your medicines, u need to be fine soon for me okay?

You shooked your head

Nathan: okay fine I'll sing your favourite song too. now take it.

He started singing..

A nurse and a doctor were passing by outside that cabin.

Nurse: How nicely that guy is singing a song. How is the patient related to him?

Doctor: (smiled) He himself is the patient. check inside the room, only then you'll get to know that, there is nobody inside, except him.

Nurse: whatt???

Doc: Yes. he was a heart patient. Few years ago his wife gets to know about her brain tumor, so she decided to donate him, her heart. but she didn't know that in the process of giving him a life, she took away his reason to survive. And now, he is just a mental patient with memories of his beloved dead wife.