Pranks...

I'm in a prank war with someone at work and everytime I come up with something good...she hits me stronger and harder. So I need some help. If anyone has some ideas on a great prank that could be done at work...without getting in too much trouble :) I would be so grateful! Just to let you know, the biggest thing she's done was stuck a fake rat in my garbage can, tied fishing wire around it, strung the wire under the desk to the other side and had someone yank the wire while I was working at my desk to make the rat rattle around in the garbage liner. That disgusting rat thing was literally jumping in the garbage...I NEED TO GET HER BACK GOOD!