A man walks into a hospital ward and starts inspecting the bed charts.
A doctor notices this and says, "Excuse me sir, but what are you doing?"
The man just ignores the doctor, and starts to take everyone's blood pressure.
"Sir, I'll ask you again", says the doctor, "Why are you here and what are you doing?"
Ignoring the doctor again, the man begins to take blood samples, and starts processing them through the hospital's examination equipment.
"That's enough!" shouts the doctor. "Now you're testing my patients!"