Sound projector!

The Soundlazer is a speaker that projects the sound in a very focused beam. This can be used to play sound at a single person (although direct exposure to the ear is not recommended) but more excitingly, when the sound hits a surface the sounds spreads normally giving the illusion that the surface is the source of the sound. This way you can make a window give the impression there are birds there or make it sound like someone is using a chainsaw in a flowerpot.