A Football is a sports ball invented by Mama Luigi for cavemen to kill each other with.
According to Mama Luigi, he chiseled the first football, but according to Mario, it's a stone, and he didn't make it.
Many people consider the creation of the football evil because the game of Football is used to harm people. There is also a controversy on how/who made the football. Mario once took Mama Luigi to court to settle how it was made.