I do get this from time to time. I'm just not "with" the rest of world sometimes, and people may pick up on it. I laugh to myself, laugh at things people say that aren't inherently funny, yet contrast or mesh superbly with a current train of thought and I'll laugh. Throw in some sensotard moments [I tried to turn on my TV with my car key remote the other day] and I definitely got that in high school. Funny because I never touch drugs, [I know I have an addictive personality for some things, mainly adrenaline and experience addictions] because I have personal control issues and I'm paranoid enough as it is, I don't need hallucinogenic help.
Also, I did even get put on suicide watch in high school, which I found very amusing [my ESF mother, of course, did not]. Schizoidal tendencies, lack of sleep, palpable aura of boredom, and a habit of including nihilistic song lyrics in my AIM away messages compelled somebody to report me. Never found out who that was.