Johnny goes to an Ophthalmologist (eye doctor).
The Doctor asks him ” What’s the problem”
Johnny complains, “I keep seeing black spots in front of my eyes.”
The Doctor asks, “Have you ever seen any doctor?”
Johnny replies, “No, just black spots.”
Tommy: Doctor will the operation be successful?
Doctor: Yes. The operation is very complicated, 4 out of 5 people die in this kind of operations.
Tommy: Then how come you are so sure that I will be alive after the operation?
Doctor: Because already 4 have died and you are the 5th.