With Valentine's Day behind us, it's time to take a look at a few drivers who probably didn't buy one another a box of chocolates. Bad blood and hot heads are nothing new in the racing world, so let's take a look at some of racing's most provocative and interesting disagreements.

No. 5 Sam Hornish Jr. (and Sam Hornish Sr.) vs. Tony Kanaan at Watkins Glen, 2007

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No. 4 Danica Patrick vs. Milka Duno at Mid Ohio, 2008

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No. 3 Clint Bowyer's crew vs. Jeff Gordon at Phoenix, 2012

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No. 2 Nelson Piquet vs. Eliseo Salazar at Hockenheim, 1982

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No. 1 Tony Stewart vs. Matt Kenseth at Bristol, 2012

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And you can't have a list of famous racing fights without adding the granddaddy of them all:

Donnie Allison vs. Cale Yarborough at Daytona, 1979

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Bonus: Taki Inoue vs. a medical car (the medical car won), Hungary, 1995

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One we forgot: Paul Tracy takes on Alex Tagliani and Sebastien Bourdais in 2006 Champ Car season

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