Hannah Bond, 13, hanged herself from a bunk bed in her bedroom with a tie believing her death would impress fellow followers of the "emo" movement, it was said.
The teenager, who left a suicide note and used the nickname "Living Disaster", committed suicide after flippantly telling her parents, "I want to kill myself", when she returned late from a friend's house.
They dismissed the comment and said "don't be silly" but an hour later found her suspended an inch from the floor.
They dialled 999 and paramedics battled for over an hour to save her but she had lost consciousness and died.
Roger Sykes, the coroner who recorded a verdict of suicide, found aspects of the youth movement, which began in America, "very disturbing".