Forgetting Sarah Marshall opens today, remember? Of course you do, because the movie’s marketing campaign has flooded the city for months with posters like “You Suck, Sarah Marshall,” pissing off a lot of real-life Sarah Marshalls in the process. By now, you know that it stars Jason Segel (Knocked Up) as a jilted slacker who books a Hawaiian vacation to get over his ex, only to find her at the same hotel with her......