Peanuts?

A man walked into a bar, sat down, and ordered a beer. As he sipped the beer,  he heard a soothing 

voice say, "Nice tie."   Looking around, he noticed that the bar was empty, except for himself and the

  bartender at the end of the bar.   A few sips later, the voice said, "Beautiful shirt."   At this, the man

 called the bartender over. "Hey, I must be losing my mind,"  he told the bartender. "I keep hearing

 these voices saying nice things, and  there's not a soul in here but us."   "It's the peanuts," answered 

the bartender.   "Say what?" replied the man in disbelief.   "You heard me," said the barkeep. "It's the

 peanuts... they're complimentary."