Breast Milk
This is possibly the most disgusting entry on this list but it’s also a phenomenal example of revenge. Earlier we saw how someone put estrogen supplements in their drink. But this woman took it to the next level by adding her breast milk to her coffee creamer. That’s a nasty surprise for any office thief because nobody wants that.

Imagine somebody turning as green as the Hulk and vomiting on the spot after reading this. The problem is that if they want to maintain an innocent facade they can’t say anything. It’s one of the best responses we’ve ever seen but it’s slightly disturbing. They showed a lot of dedication to the cause with this effort (via The Sun).