It's the nuts - they're complimentary

A man went into a bar after work and ordered a beer.

As he started drinking his beer, he heard a female voise saying seductively, 'You've got nice hair'.

The man looked all around him but couldn't see where the voice came from.

A minute later he heard the same voice saying, 'You are a handsome man.'

The man was really puzzled by this so he asked the barman what was going on.

The barman replied, 'It's the nuts - they're complimentary.'