Sometimes when shopping online you could make a mistake and buy a shirt in the wrong size or wrong color. It happens. These fans happened to buy tickets to the wrong college football championship game.
Mixing up the ACC and AAC Championship games seems like it would be pretty easy, and to be honest, I'm surprised it hasn't happened before.
Although, it'll probably be pretty disappointing to miss out on Temple's first conference championship in football since 1967.
Hopefully they enjoy watching two teams they have (probably) zero connection to in Clemson and Virginia Tech, at least the tickets were cheap.