Staying for a new tune

How do you prevent an audience from heading for the restroom or concession stand during your new songs?  Has any artist ever prefaced a new song with, "Here's one you'll know?"  If the song is catchy or inspired enough, I could forgive an artist for faking the audience out that way and even saying at the end of the song, "That wasn't so bad, was it?  That's actually a new song.  Thank you for indulging me."