One day an extremely nervous dental patient came for a root-canal surgery. He was brought into the examining room and made comfortable in the reclining dental chair. The dentist then injected a numbing agent around the patient's tooth, and left the room for a few minutes while the medication took hold.
When the dentist returned, the patient was standing next to a tray of dental equipment, "What are you doing by the surgical instruments?" asked the surprised dentist.
Focused on his task, the patient replied, "I'm taking out the ones I don't like."
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