eating the wrong mushrooms and getting very sick or possibly dieing, only buy shrooms of ppl u know and trust.
there's no such thing as a "bad" trip. if you have a bad time the mushrooms are probably trying to teach you something. learn from them. it's not all about getting high and seeing funny things. respect them and learn something from your experience. all trips can be good trips.
You just went over half of the peoples heads who will read this thread with that post yem. Sadly most people eat mushrooms to get fucked up and see funny things, including some of my friends. I agree any trip can be good, from a "bad" trip I have gotten over my arachnaphobia. Now to eat some mush and go skydiving to conquer the fear of heights.
if you have a predispostions (sp?) to mental disease, i.e family history of schizophrenia. Then you should probably stay away. They are a good tool for insight. I know people who are depressed, take them and understand their problems afterward. Also never pick your own unless you absolutely know what you are doing.
The only harm I have ever read about, besides the people who weren't mentally prepared for a powerful trip, is eating the wrong kind, and a stomachache from eating too many. There can be problems if you have a history of mental problems, as stated before, but the real harm is only the fact that a person has mental problems and can't handle a psychedelic drug. It can create more problems similar to what they are already experiencing. Other than that, shrooms are the safest drug you can injest. It's safer than caffine! Just let the drug open up parts of your mind that you can't access and have a good time.