When MagSafe unplugged, the external display and laptop need to be restart

Whenever I unplug my MagSafe when using dual-monitors, my MacBook and External monitor need to turned off/restarted. Why is this?

So, you're saying that when you disconnect the power cord (MagSafe) BOTH of your displays either go completely dark while the MacBook is still running or freeze (static image, nothing gets updated) or begin to display distorted video. Then when the displays enter one of these states they remain dysfunctional until you power cycle each one (which would mean that for the MacBook's display you'd have to restart the MacBook). Otherwise, are you suggesting that your MacBook crashes when you disconnect the MagSafe? Also, do you have to reconnect the MagSafe before you can restart the displays (if this is the case, then are you sure that your battery just isn't "dead")?
What type of connector are you using for the external display? Is it Mini DisplayPort, DVI, or VGA? If DVI, is it dual-link?
In any case, without additional details I'd guess that you have a grounding problem between your external display and the MacBook. This shouldn't happen unless there is a problem with your video cables or adapters or with the ports on either the MacBook or your external display. Have you tried connecting the 3.5mm audio output on your MacBook to an audio input on the external display (as a test to provide another grounding path)? Also, is your MacBook power supply plugged into the same AC outlet as is your external display?
I guess the MagSafe connector could also be at fault if it is shorting to ground when you remove it from the port on the MacBook. What happens if you disconnect the power supply directly from the AC plug and then disconnect the MagSafe?
Lastly, is there any chance that you are getting a static electric discharge when you touch the MacBook to remove the MagSafe connector?

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