Police say a group of people had been together at the Side Pockets bar in the 600 block of South Tyler. As they left, a 28-year-old apparently jumped on to the back of a moving car. He fell off, hitting his head on the pavement.
He was taken to the hospital with what police are calling extremely critical injuries.
"We're waiting word from the hospital to see what his prognosis truly is," said Sergeant Jim Merrick. "Head injuries can be tricky, a fall on pavement can sometimes be fatal."
Police say it appears alcohol was a factor. The car involved left the scene. Investigators are looking for a late model Pontiac.