"I thought, like, maybe someone else jumped inside her body, like 'Where's my mommy?' She's gone," Haddish says.
Tiffany Haddish said her mother was never the same after suffering a head injury.
In a preview clip for Friday's new episode of Netflix series "My Next Guest Needs No Introduction with David Letterman," the "Girls Trip" star opened up about her mom's "very violent" behavior when she was growing up.
According to Haddish, her mother turned into a completely different person after she suffered a head injury from a severe car accident.
"When I was 8, about to be 9, she had a car accident and her head went through a windshield," she recalled. "By the grace of God, she lived. But she had to learn how to walk, talk, eat, everything all over again."
"I didn't want to be with my mom no more," she added. "She had became very violent and very verbally abusive. You never knew who she was going to be. Every day was like a different day."
The behavior became so severe the actress wanted to move away from her mother.
"I used to be begging my mom if I could go live with my grandma," Haddish said. "And my mom would yell, 'She's not your momma, I'm your momma!'"
The "Night School" star grew emotional. "[The accident] changed everything about her," Haddish said, tearing up. "I thought, like, maybe someone else jumped inside her body, like 'Where's my mommy? She's gone.'"
Haddish has previously spoken about her difficult relationship with her mother in her 2017 memoir "The Last Black Unicorn."
"After the accident, oh my God, she would say the worst things to me, like 'You look like your ugly ass daddy, I hate him. I hate you,'" Haddish wrote. "She couldn't get all her words out, so she'd just punch me. Just full on. Because of her, I can take a punch like nobody's business. Teachers would ask, 'Why's Tiffany's lip busted?' I didn't say anything. As bad as she was to me, I still couldn't help but love her."
Haddish also said her mother was consequently diagnosed with schizophrenia and was put in a mental institution, which then caused Haddish and her siblings to be put in foster care.
"The police ended up taking her to the hospital. The doctors decided she's schizophrenic," she wrote in the book. "So my mom went into a mental facility and me and my four younger sisters and brothers went into foster care. I was in group homes for a while. I hate thinking about that. It was more like prison. My comedy skills came in really handy. I thought that if I made these girls laugh they wouldn't beat me up. But bully girl said, 'Ahh bitch, we still going to beat your ass... but you funny.'"