Did you eat earlier in the day? Sometimes when you havn't eaten all day(specifically to speed users) and you smoke a joint later in the day shit happens. I use to take a lot of adderall and wouldn't eat the entire day. Then late at night with my friends, we seem to get the munchies and *boom* I get off the couch, walk in the kitchen, and crumble to the floor. Woke up and my friend had thought I died. I had a huge ass bump on my head, but didn't feel the pain. It only lasted for a few seconds but it felt like the experience I had with the "falling shotgun"<-


Google it.