She was 13 and he was a twice-divorced 22-year-old when they were married. Normally that description alone would be enough to qualify as off-putting. But wait, she was also his cousin (technically the daughter of his first cousin, but still). Jerry Lee Lewis was a fiery character, but this marriage was considered even too wild for him. It reportedly derailed his mainstream rock-'n'-roll career and gave preachers plenty of ammunition against the burgeoning rock scene. After two children and 13 years of marriage, the controversial couple eventually split.