In life, there are people you don't want to screw over. This list and sagely advice comes from Akron, Ohio designer, Craig Miloscia at Optic Lingo. Optic Lingo specializes in product, graphic, environmental, and interactive design. While most of us try to be honest and forthcoming when it comes to people, there are a certain few who will make our lives a living hell if we get on their bad side. These are the people who don't want to screw over until you change the dynamic of your relationship with them. Some of this can have some very unfortunate outcomes. Can you think of any others that should be on this list? If so, feel free to let us know!