A blonde 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
there. 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.