Matthew McConaughey's father died during sex and his mother refused to let paramedics cover up his body to allow neighbours to see his naked body.
The 50-year-old actor discusses his parents' turbulent relationship in his new memoir Greenlights, in which he described the couple as "like the Pacific Ocean in a storm".
McConaughey's parents divorced twice and married three times, but in spite of their rollercoaster romance, his dad, James, insisted that his life would end alongside his mum Kay.
According to the Dallas Buyers Club star, James was convinced he would die while "making love" to his wife.
It turns out James correctly predicted his death, as McConaughey writes in his book that he "had heart attack when he climaxed" during sex with Kay.
McConaughey previously told People: "I got a call from my mum: 'Your dad died'. My knees buckled. I couldn’t believe it. He was my dad. Nobody or nothing could kill him. Except mum.
"He’d always told me and my brothers, 'Boys, when I go, I’m gonna be making love to your mother', and that’s what happened. He had a heart attack when he climaxed."
Revealing the parts of the story he didn’t add into the book, McConaughey revealed that his mother wouldn’t allow his dad’s body to be covered up to be taken out of the house, so he could show off his manhood one last time.
The Hollywood star told WTF with Marc Maron podcast: "I found out later that when the ambulance came to get him at the house, obviously all the neighbours came out on the street.
"They came and told me later that my mum, in her negligee nightie that she had woke up in, wouldn’t let the paramedics cover him.
"She kept ripping the sheet off going: 'Uh-uh, I want the world to see why his nickname was Big Jim, don’t you cover him."
Elsewhere in the book, McConaughey opens up about being "blackmailed" into sex when he was a teenager.
He wrote: "I was blackmailed into having sex for the first time when I was 15.
"I was certain I was going to hell for the premarital sex.
"Today, I am merely certain that I hope that’s not the case."
McConaughey is now a father of his own, and in an excerpt of his book featured in People, he explained that being a dad was "the only thing [he] ever knew [he] wanted to be".
The actor, who shares three children wife Camila, 37, says he "can’t think of anything being more important", and he is confident in the fact that his kids "do not question" the love they have in their family.
Greenlights by Matthew McConaughey is out now