One guy sent the following email to his colleagues:

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From: $user who for whatever reason came in on Monday when no one else was in the building.
To: IT Dept.
Re: A/C constantly running.

Hi Guys,

I came in today (Monday) to finish up a project I was working on before our big meeting with a potential client tomorrow, and I noticed that there were three or four large air conditioners running the entire time I was here. Since it's a three day weekend, no one is around, why do we need to have the A/C running 24/7? With all the power that all those big computers in that room use, I doubt it is really eco-friendly to run those big units at the same time. And all computers have cooling fans anyway, so why put the A/C for the building in that room? I got a keycard from $facilitiesmanager's desk and shut off the A/C units. I'm sure you guys can deal with it being warm for an hour or two when you come in tomorrow morning. In the future, let's try to be a little more conscientious of our energy usage.

Thanks.

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Well, this was the RESULT:

Fatalities: Exchange Server, Domain Controllers, a few Sun boxes that I'm not sure of the usage.

Near-Fatalities: Phone Switch, Apps Servers.

Temperature of server room 7AM Tuesday Morning: 90 Degrees Fahrenheit.

Status of Employee who sent the above e-mail: Terminated.


Gagan
So Dont try to be smart always:)
Think twice before you turn off some switch:D
(source: http://community.livejournal.com/techsupport/1368038.html
Acknowledgment: Tuomas)