Post office -"Doctor! I think there is something wrong with my eyes." -"I think so too. This is a post office."
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DNA - "I have good news and bad news", the defense lawyer says to his client. - "What's the bad news?" The lawyer says: - "Your blood matches the DNA found at the murder scene." - "Dammit!" cries the client. "What's the good news?" - "Well," the lawyer says, "Your cholesterol is down to 140."
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Razor-blade "Doctor, please hurry. My son swallowed a razor-blade." "Don't panic, I'm coming immediately. Have you done anything yet ?" "Yea, I shaved with the electric razor."