JACK'S TELEPHONE NUMBER...
 

Blonde Caller: "Can you give me the telephone number for Jack?"

Operator: "I'm sorry; I don't understand who you are talking about".

Blond Caller: "On page 1 section 5, of the user guide it clearly states that I need to unplug the computer from the AC wall socket and telephone Jack before cleaning.

Now, can you give me the number for Jack?"

Another good blonde joke to add to my collection :)