Authorities said the Kentucky-Louisville basketball rivalry boiled over at a Kentucky dialysis clinic when one patient punched another during an argument about the two teams.

According to Georgetown police, the altercation began Monday with a verbal exchange between the 68-year-old Kentucky fan and the 71-year-old Louisville fan.

The Kentucky fan, who was receiving treatment,  flipped off the Louisville fan, who responded with a punch to the face.

Police were called, but the Kentucky fan declined to file charges.

The Wildcats and Cardinals, hated rivals, meet Saturday in New Orleans for a spot in the NCAA championship game Monday. Some wags are calling it the biggest sporting event in the state's history.