Gas light goes on. Pull over at nearest exit. Pull into only gas station. Take a total guess as to which side the gas tank door is located on the rental car. Get it wrong and turn around. Absent-mindedly pull next to the pumps with the same wrong side facing pumps. Pull forward and back into original pump with the correct side facing pumps. Fill up tank, but only $ 15 worth because you pre-paid gas. Pay, and get back onto the freeway.