Oh, to get super sassy at work… We all have that one coworker that just brings out the worst in us. Usually, our pettiness comes from a place of reason. Have you ever had to teach someone a lesson after they proved time and time again that they were lousy workers? This manager got really feisty after her cashier kept arriving 3 hours late to work (yes, you read that right) due to getting her hair and nails done. You would think she'd be fired for being consistently late in this manner, but appa…