What drug makes you giggle and such stupid things?

Do not inhale the air from an air horn! That can kill you by doing it once, very easy to asphyxiate yourself! If you eat a small amount of mushrooms, you may get giggly and giddy and not be able to stop smiling. That is only if you are happy and mentally healthy. Otherwise, you may have a terrible time and think you are dying. Drugs are dangerous, you should just watch a funny movie.