There aren't many givens in a sport as chaotic as college football, but rivalry week coming with a wide array of trolls was probably as assured of a bet as you'd find this week.

Per tradition, the final week of the college football regular season paired a number of local and long-distance rivals alike, with trophies and bragging rights being bestowed to the winner. One additional -- if admittedly minor -- benefit of claiming a rivalry week victory? The ability to troll your opponent on social media afterward.

Take Iowa for instance.

The Hawkeyes earned a win over their rivals to the west, Nebraska , on Friday, and had a simple but timely jab at the ready. Playing into the Black Friday game-day theme, Iowa posted a photo of a receipt between a Hawkeyes football helmet and the Heroes

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