Trailers Weekly: “21 Jump Street”, “Cabin in the Woods”, “What to Expect When You’re Expecing”, “Fat Kid Rules the World”, “On the Road” Michael Lee, March 10, 2012March 10, 2012 Trailers Weekly is a feature in which we bring you the most popular and talked about trailers of the week. Sharing trailers is a classic viral practice, and trailers are still the most mainstream way for people to learn about movies. We got the hilarious red band trailer for 21…