I've done acid over 100 times and shrooms over 200 times. I never had a bad trip on acid. Only had 2 bad trips on shrooms but the last one was really, really bad. My own fault though I was going through a weird time in my life and didn't follwo the #1 rule of doing psychedelics. Like WhosGotTheHerb said above "don't do it if you're stressed or depressed or have a lot on your mind."