The Leah Betts story is a famous UK case.

It's controverial because it involves the drug Ecstasy. Apparently people who take Ecstasy can and do dance all night, overheat, sweat a lot to cool down, and so become dehydrated. They need to drink a lot to compensate. Leah took the drug, and then felt a bit funny. She must have decided she was dehydrating and needed some water. When that didn't help she drank some more. She still felt funny. Towards the end she must have been forcing herself to drink, believing she would die if she didn't. The water killed her.

Her parents say it was Ecstasy that killed her. Some people say she died of ignorance.