 Even small amounts of alcohol impairs your frontal lobe. Frontal lobe is the part of the brain that makes decisions, that takes in information and processes information. It's a rational, logical part of the brain. I'm sure that nearly everyone can think of a time when they hopped into a vehicle when it was probably not the most ideal choice. You live and learn from that, but there's a lot of people in this world that unfortunately have not got away with it and they're either severely injured or been killed.