In the NFL, favored teams aren't always the better teams.
A host of factors go into picking favorites and underdogs. Trends have a lot to do with it, as do matchups. Home-field advantage plays a role, as does travel distance for the road team.
Many people don't know this, but when Vegas puts out a betting "favorite," that isn't necessarily the team the oddsmakers think will win the game. Lines (how many points the spread is) have nothing to do with how much Vegas thinks the favorite team should win by. Favorites and spreads have one purpose and one purpose only: get suckers to bet on them.
Bettors (for the most part) figure all of this out pretty quickly, but that doesn't change people week in and week out asking "why is so-and-so a favorite?"
So, which teams are on upset alert in Week 8?