Once I got used to smoking I never thought I would have a bad trip again. Then I went to my new school on the first day baked and found out I was dead wrong. Same thing at the party where I didn't know anybody. And the time I got baked out in the woods that I've never been in before. And the time I re-visited my home town and got re-acquainted with hydro purple kush beside a lake, in a city that I hadn't been to in a year (most intense, but also worst trip Ive ever had). And the time I got baked with my new girlfriends brother at the top of a water fall, sitting on the edge of a cliff over tons of pointy rocks (I thought he was going to push me off...).
It's kinda strange, I read somewhere that THC helps people adapt to new situations and surroundings, but it seems to do the opposite to me, and other people apperently.