In January 1969, when George Harrison played Macca his demo of All Thing Must Pass (George was pitching songs for the next album), McCartney pretended he could hear the phone ringing in the next room and practically ran out of the room shouting 'I must get that.'
Suffice it to say that Macca and his group didn't get that; instead, George saved it for his own jaw-dropping triple album of the same name he brought out eighteen months later. Much to McCartney's chagrin.
People who have met Paul McCartney will tell you he's shrewd. Well, let me tell you, he ain't that shrewd.