"Next time you host a party, wouldn't it be great if your guests could choose what kind of entrance to make? The Make-an-Entrance Party Doorbell lets them do just that. It’s a wireless doorbell that has four buttons. Your guests can select between themes you choose, say, royal fanfare, heavy metal, Star Wars, or cheering sports fans. When they push the appropriate button, a regular doorbell sound is heard inside. But when the door is opened, a sound effect is played to
match their selection."
Follow the full project at: http://makezine.com/projects/make-an-entrance-party-doorbell/