It's a rivarly between friends.
"I made the state fan drive, just because, you know, I should be riding in luxury," said Glenn Freeman, a Michigan fan.
Freeman and his friends' loyalities are split: two for Michigan and two for State.
The competition extends to families and neighbors, too.
"I have a house divided, you know, one going to State, one going to Michigan," said a Michigan fan.
"Our neighbors are U of M fans so we just sucked it up and came anyway," said Stacie Hurst-Boyd, a state fan.
But none of them let a little friendly competition get in the way of tailgating.
"The atmosphere is great even though I don't like ann arbor," said Jay Gerow, a state fan.
Michigan and State fans paid hundreds of dollars for their tickets. Some even drove across the country to experience the game at the Big House.
Ryan and his wife Holli Hunt drove fifteen hours to Ann Arbor, all the way from North Carolina.
"My wife bought me the tickets for our anniversary present," said Hunt, who has been married six years.
State fan Danny Trayer paid $550 for two tickets. But he said missing the game wasn't an option.
"Michigan-Michigan State. There's no better rivalry than this one," he said.
It's a tradition observed by old-timers and by those new to it all.
"It's his first tailgate on U of M land but Michigan State heart," said Hurst-Boyd about her infant son.