Jack

(Reportedly from Samsung Electronics:)

Caller: "Can you give me the telephone number for Jack?"
Operator: "I'm sorry, sir, I don't understand who you are talking about".
Caller: "On page 1, section 5, of the user guide it clearly states that I need to unplug the fax machine from the AC wall socket and telephone Jack before cleaning. Now, can you give me the number for Jack?"

(Thanks to Paz!)