How I Met Your Mother is returning this Monday for its ninth and final season. I'm pretty sure it's for real this time. You may remember that season eight was reportedly going to be the final season, but since ratings were at all time highs, CBS went into negotiations with show creators Carter Bays and Craig Thomas to do another season. All of the actors' contracts were up at the end of season 8, and it appeared that Jason Segel, who said he wanted to focus on his movie career, was the biggest roadblock. As soon as Segel signed on, everything else fell into place. Whether you've missed a bunch of episodes or you just need a refresher, these are the top five things you need to know going into season 9.