this would probably fall into the same vein as [the "Server Names" question](http://serverfault.com/questions/3668/what-are-the-most-manageable-and-interesting-server-naming-schemes-being-used) - "bad subjective" because there's no real way to decide what's the "best" prank ever pulled - it would wind up being a list-of-things rather than something of constructive use (though I suppose you could argue that coming up with a creative new way to scare the pants off your employees has some constructive merit it would be a little hard to say it's "professional" :-)

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Of course nothing stops you from [hopping into chat](http://chat.stackexchange.com/rooms/127/the-comms-room) to talk about pranks - you've got 10 days left to plan!