While I don't have a flickr account, I enjoy it. I like getting links from my friends to view their images, and searching through random tags of images can practically become a pastime. I came across a group of images that were tagged as 'Office Pranks.' They are a must share. If you have cubicles at work, I'm not saying these should inspire anything. I'm just saying I hope you enjoy these images.
Tin foil office:
Balloon filled cubicle:
Rubber band telephone:
Cubicle filled with cups of water: