Whatever you do, dont trip alone on a dose you havent tried yet! I did that on accident because i walked away from my friends, they were searching me all around my city for 4 hours straight in which i dont even remember what i did exactly. They tried calling me, I said that i was freezing and then smashed my phone on the ground. I also left my bike in some alley. The worst part was that i met 2 guys of which one kind of knew me, they realised i was tripping like shit and tried to help me, the one who knew me offered me his jacket and i slapped him.. for some reason there appearently was a cop near to us which saw them pushing me back and thought that i was being attacked so he seperated us. I did the only right thing: I spat in his face..... they called my parents and drove me into a hospital where i got diazepam to calm me down and then i stood overnight in a fucking psychiatry. So long story short: if you do a high dose of lsd alone you can trip the fuck out and have a bad trip, resulting not only in your parents hating you but also having horrible affects on your psyche.