In the hospital waiting room, a big brother keeps looking at his watch.

I ask him if he's in a hurry?
He says, "My appointment is at 10 o'clock, and it's now 11:30, and it's still not my turn."
I say, doctors are busy, please understand.
He says, "I understand, but what I don't understand is—
Last week I had an appointment, the doctor saw me for five minutes and then told me to go.
Today for a follow-up, I waited two hours, and it will probably be five minutes again."
I ask, then why are you still coming?