We had an early April's fool joke at work last week. Someone put up a sign on the copier saying something akin to:
"This copier has been updated with Microsoft Voice recognition software 1.4. Simply say one of the following commands: "Copy", "Collate", [etc...]. Please note that this machine is still "learning" our voices, so you may have to say the command multiple times"
There is, of course, no voice recognition software or the necessary hardware to do so on that copier.