When people run around and around in circles, we say they are crazy...
When planets do it, we say they are orbiting.
When using a public campground, a tuba placed on your picnic table will keep the campsites on either side vacant.
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."