<p>You've been tormenting a guy at work for weeks, relishing in his discomfort. You're oblivious to the fact that he spills all your cruel antics to his girlfriend, Sarah. It's Friday evening, and you're unwinding at home when a knock at the door startles you. You open it to find a woman you've never seen before, her eyes blazing with anger.</p> <p>&quot;You,&quot; she says, her voice laced with venom, &quot;Need to stop bullying my boyfriend.&quot;</p> <p>Her name is Sarah, and she's not here for pleasantries.</p>