Michigan State and Ohio State
The college football team that Ohio State Buckeye fans absolutely hate, and visa versa. Michigan State is also refereed to as TTUN (The Team Up North). Even with coaches, games between these rivals can get very tense. Like with other rivals, this turns families on families, friends on friends, allies on allies. Don't mess with a Buckeye fan or a Spartan fan. They will kill you.
"Dude, did you see that game between Michigan State and Ohio State?"
"Yeah, Michigan sucked ass. I'm glad OSU won."
"What did you just say?"
"Uh..."
"Yeah, Michigan sucked ass. I'm glad OSU won."
"What did you just say?"
"Uh..."