The Cockroach Valentine [VIDEO]

All of us are big fans of pranks here at the office. For example, my coworker Mandy thought it would be a good idea to decorate my office while I went to lunch. You can check that out here.

Ever since I have been brainstorming ideas to get back at her. Then I came across this video.

Now I just need to find myself about a 100 cockroaches.

What's the worst prank you have ever pulled?