Input device vibrator

Many people have wrong habit of typing by seeing at the keyboard instead of the monitor. Well that is up to them to correct it, but most don't.
But the major problem is they will miss any alerts on the screen. Sometimes the speaker tries to alert you. But i disconnect the speaker (even the pc's internal speaker) at night to avoid disturbance to my room-mates. Also, for others, there is one more problem opposite to mine - a small beep is not that attention catching.. especially when they hook their thing to a 3000watt speaker system . Or use a powerful Headphone for rock music. So instead I propose a keyboard and mouse with in built Vibrators like the ones on most Cell Phones. Simple. Effective if you are typing or drawing. May even increase immersion into addictive point and click games, just like the feedback joystick.