Don’t drink alcohol within hours of eating this mushroom or its similar relative, the alcohol inky cap (Coprinus atramentarius). The combination may sometimes cause temporary but frightening symptoms that vanish after a few hours.
For unknown reasons, this happened after I served the shaggy mane to a girlfriend who never drinks. I had no reaction to the same dish, but she developed a red flush, her gums felt like they were inflamed, she thought she was going to die, and started to shake (with rage toward me).
Within a few hours, most of the symptoms disappeared (except the rage), but there was a long-term, unexpected delayed reaction: the following Valentine's Day, she ran off with another guy!