Around the time The Division Bell came out some anonymous user started posting messages to the usenet under the name Publius. He claims to be a messenger sent to guide Floyd fans through a riddle or 'Enigma' burried deep within the pictures, words and... more
At the end of High Hopes, fast forward until around 8:18. Turn the volume up a little. You should be able to hear a man having a rather short telephone conversation with "Charlie" who hangs up rather abruptly.