There is nothing worse than working for a bad boss, so when the opportunity presents itself to get even with a little petty revenge, you have to take it. 

That's what one British IT contractor did when his boss told him he wasn't allowed to park in a public space, despite his boss using an identical area. Learning that he could drop only 20 extra quid on a rental car for the week, the contractor took his "new" car to work, and left it horizontally in the space, ruining his boss's parking scheme. When asked if it was his, the contractor responded, "Of course not, you know what I drive." Hopefully, that taught the boss a lesson on sharing public areas. At the very least, it made the contractor feel very good. 

Check out that story and plenty of others about employees who were able to enact their masterplans of petty revenge against their bad bosses.