I'm not sure if this is an "old one", even so it's ok for a slice of midweek
humor :

<<
Boris Yeltsin, Bill Clinton and Bill Gates were invited to have dinner with
God.
During dinner He told them: "You are three very important people and I've
called you so you can send out my message to the world. Tomorrow I will
destroy the earth!"


Yeltsin immediately called together his cabinet and told them: "I have two
very bad news items for you, one God really does exist and two, tomorrow He
will destroy the earth."


Clinton called an emergency meeting of the Senate and Congress and told
them:  "I have good news and bad news:  The good news is, God really does
exist, and the bad news is that tomorrow He's destroying the earth."

Bill Gates went back to Microsoft and happily announced, "I have two
fantastic announcements:  First, I am one of the three most important people
on earth and second, the year 2000 problem is solved."
>>

Costas Anastassiades,
Athens-Greece