I have friends that I know are high, because they do such odd things. A friend of mine used to line up crumbs in a row on a desk or table. I found out later that when they were smoking crack, they would pick the crumbs up off the floor, thinking they were crack. Another friend of mine used to walk around with a blue color on his clothing. Here he was "sucking" the outter layer of Oxycontins off, so he could snort them. Had I known at the time about this behavior, I would have known that they were using. To help clue me in to some of these strange behaviors, and maybe the drugs that they are using, I was wondering if there were any examples that people had, things that they did, or behaviors exhibited when they were using, to help me figure out maybe whey they are doing this, and what type of drug they may be using at the time.