I work with long distance truckies, and they have wicked senses of humour..I have my mouse (computer) kidnapped quite often and get ransom notes, have had lizards, cockroaches, even a small snake put in my office drawer, and the most organised was when they managed to talk security into letting them onto to roof to send my office chair bungee jumping which they then sent me the video to my phone on my night off!
Proffessionalism...um no....makes my workplace probably the coolest I have ever worked...heck yeah!
Does anybody at your work play practical jokes?