One of the best computer jokes I ever came across was a program that left the computer on standby until someone hit a key then the screen would flash the following message
"Warning - water has been detected in your A drive"
"Spin cycle now starting Draining A drive" Then a rising whine like a washing machine would come out of the computer followed by the message
"Drain cycle now complete - please resume"
I pulled this one on some colleagues and actually caught them looking under the computer to see where the water was coming out.
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