The receptionist was instructed to call a vendor. Using the vendor's
invoice as the source of the phone number she began calling. Each time
she called, her phone would ring. When she answered, no one was
This continued throughout the morning. When later asked if she reached
the vendor she explained what was happening and demonstrated for her
superior. He noticed that the phone number she was calling (which was
on the vendor's invoice) WAS THEIR OWN PHONE NUMBER! She had spent an entire morning calling herself.