Former AC/DC lead singer Bon Scott was once asked if he was AC or DC. “Neither,” he grinned, “I’m the lightning flash in the middle.” And that’s how he lived his life. In this edited extract from his new book, Bad Boy Boogie, the first biography to focus on Bon’s remarkable gifts, author JEFF APTER shares an insight into the lyricist, frontman and rascal of Australia’s legendary band…