This is a very interesting invention that three people came up with called SoundBulb - it's a light bulb that also sports a speaker. It has a built in WiFi and Bluetooth receiver so that it can get streaming sound from a device like a computer. You can adjust the volume by turning the larger end of the bulb.
It's not being manufactured yet, but just think how cool it would/will be! You could really freak someone out if you sneakily swapped out their one of their light bulbs with one of these and started messing with them! Haha