1. Pillow phones - for talking on the phone when your in bed.
2. Car honks that can direct the sound to the specific idiot you are trying to communicate to.
3. Cars that have only a certain amount of honks allotted before the honker gives out and stops working. Use them sparingly... They are not unlimited!
4. Lazy rivers instead of streets.
5. Ping pong ball with different tones (specific musics notes) when they hit. Musical balls!