A dose of MDMA transformed a white supremacist
bbc.com
bbc.com
It's also the only psychedelic I'm aware of where there is no such thing as a bad trip. For example, putting people in a hospital room alone and then in an MRI machine would certainly cause a bad trip for some people on LSD or mushrooms, but this guy had a great time on MDMA (and anyone else would as well.)
It is mildly neurotoxic, though it seems the neurotoxicity is only an issue when you take it too frequently (more than 3x/year) or too much (over 2.5 mg/kg.)
Another interesting somewhat-related story is that of Daryl Davis. No MDMA involved, but lots of empathy and understanding.
Damn, there was a huge gathering of racists and otherwise unempathetic people 5 days ago...
Being hospitalized would certainly lead to a bad trip, in my opinion.