content: Knock problems you say? Can easily fix this by adding LEAD to the gasoline. We should go back to poisoning the entire population again! No, seriously, this is the solution used before by some crackpot who put his life on the line to peddle his shit solution. He inhaled the lead fumes from his gasoline mixture to prove it was not dangerous. He died soon after (insane levels of lead poisoning directly through his lungs) and we spent around 50 years breathing leaded gasoline fumes. This solution took about 20 years of cleaning before it stopped altering human behavior into the less violent range. Fear not, there is 1 company still selling leaded gasoline and they only sell it to the Middle East.