They're often very hard to predict but seem to happen every weekend. Upsets are one of the things that make football, especially at the high school level, so exciting.
MaxPreps looks at 10 games where the underdog could come out on top:
Lake Travis (Austin, Texas)Opponent: Tivy (Kerrville, Texas)Game: Friday, 7:30 p.m.
Lake Travis looked exceptional in its throttling of highly acclaimed Aledo, so much so that it jumped into the
Xcellent 25. It would appear that No. 22 Lake Travis should have an easier go of it against Tivy, but don't be surprised if Tivy makes it interesting. Even without departed star Johnny Manziel, the team is playing well, winning its first two games by a combined score of 94-7 before dropping a 38-26 decision to a very good Cibolo Steele squad.

Lake Travis will need to avoid turnovers against Tivy.
Photo by Kyle Dantzler