Sometimes it's just fun to root for an NFL underdog. The only problem with doing so is that teams are underdogs for a reason. They're not expected to win.
In Week 8, for example, only two underdogs—based on the mid-week odds—actually came out on top. Against the spread, however, seven underdogs came through.
For many fans, the betting line helps to add another exciting layer to NFL games. It also makes it a little easier to back underdogs in games that don't appear so evenly matched. The trick, of course, is identifying the game in which it's smart to go against the favorite.