The noise-cancelling microphone called Hitori de Karaoke DX actively encourages you to belt out your favorite epic anthem or sing to your hearts' content in the comfort of your home without disturbing anybody around you.
Here's a video showing the Hitori de Karaoke DX in action.
In all fairness this could be an ideal solution to the late night bedroom musician looking to record vocals too without upsetting the wife/husband/neighbor/etc.
Via: The Creators Project
If you're more serious about your vocals, check out this video course: The Art of Audio Recording 104: Recording Vocals at AskVideo.