The 44-year-old action star surprised his dad, Rocky Johnson, with a new car for Christmas.
In an Instagram post on Friday, Dwayne described his dad as a "minimalist" who never asks for much, and then went on to share his father's heartbreaking story of overcoming all odds as a teenager in Amherst, Nova Scotia, Canada, and raising one of the world's biggest movie stars.
"My dad's dad died when he was 13yrs old," he wrote. "That Christmas, my dad's mom had her new boyfriend over for Christmas dinner. Her boyfriend got drunk and pissed on the turkey. My dad went outside, got a shovel, drew a line in the snow and said if you cross that line I'll kill you. The drunk crossed it and my dad laid him out cold as a block of ice."
According to Dwayne, police were called to the family's home and gave them an ultimatum.
"They told my dad's mom that when her boyfriend regains consciousness, he's gonna kill your son so one of them has got to go," he continued. "In front of the entire family, my dad's mom looked at him and said get out. He was 13yrs old and now homeless."
Rocky eventually carved out a successful professional wrestling career, becoming a part of the first black tag team to win the World Tag Team Championship in the World Wrestling Federation in 1983.
"Every Christmas, I always think about that story and my dad having every odd stacked against him at 13, but he fought thru it and still made something of himself," Dwayne wrote. "Makes me appreciate his struggle and hard work."
In passing down the family trade, Rocky pushed his son hard in the gym -- something The Rock, who also gifted his uncle a car last Christmas, admits he wasn't fond of at the time, but now embraces.
"Made a man outta me," he wrote. "Without pissing on my turkey."