Ophthalmologist

One man enters in an ambulant and says to the doctor:

– Help me, please. I have a knife in my back.

The doctor, looking his watch says:

– Now is 2:20 PM, and I work till 2:00, so as you can imagine I’ve finished for today, and I can’t help you. Be so kind and come tomorrow morning, at 8:00.

– But tomorrow morning I will be dead. You must help me now.