The Biggest Cavity

"Open wider," requested the dentist, as he began his examination of the patient. "Goodness!" he said startled. "You've got the biggest cavity I've ever seen -- the biggest cavity I've ever seen." "OK Doc!" replied the patient. "I'm scared enough without you saying something like that twice." "I didn't!" said the dentist.
"That was the echo."
Originally published November 14, 2002.