LSD, which stands for lysergic acid diethylamide, is a very powerful hallucinigeneic drug. Many people know LSD as "acid". This drug was much more common in the 1960s and 1970s but is still common today. Some common hallucincations include vivid images, bright colors, incredible shapes, and strange pictures. However, some people also experience very unpleasant effects such as panic and hysteria. Don't mess with this drug!