A man walks into an almost deserted bar and sits down on a bar stool. The bartender walks over and takes the man's order. While the man sits there in the silence he hears a faint "nice tie." He looks around, sees no one, and decides he's just hearing things.
The bartender gives him his drink and walks away. The man hears another faint voice... "nice haircut." This time he's sure he heard the words. He looks around, looks under the bar counter, checks the surrounding tables, but sees no one.
Once again sitting alone in the quiet he hears a faint "I like your shoes." By this time he's sure he's going insane so he calls the bartender over and tells him what's been happening.
The bartender smiles and says, "oh, that's just the pretzels - they're complimentary."