Yikes! Twitter can be a PR disaster when not used correctly—[see Exhibit A]. An intern at Marc Jacobs spent his last day at the job by tweeting with the company's own handle and shitting on the CEO, Robert Duffy. Read the tweets above! Apparently, Mr. Duffy is a very difficult to work for. But who knows? Maybe the small-town intern wasn't ready for the big city or the demands of the fashion world. Welcome to real life, kid.