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The 47-year-old actor shared a video of himself singing 'You're Welcome' from Moana on Instagram for a young fan with acute lymphoblastic leukemia, complicated by Down's syndrome.
Three-year-old Hyrum Harris is a huge fan of the 2016 Disney flick, watching it up to 10 times a day, and is obsessed with the character Maui, voiced by The Rock, who "makes him feel strong".
Taking to the social media platform on Monday, the Jumanji actor dedicated the video the Hyrum, who he says is in "the fight of his life right now and doing his best to stay strong".
"This message is for a little boy out there, he's 3 years old, and this little boy is one of the coolest little boys around, and he's certainly one of the strongest because he is a fighter," he says in the video. "Right now, this little boy is in the fight of his life."
He continues: "His name is Hyrum Harris. Hello Hyrum, I hope this message gets to you. You don't know me, my name is Dwayne Johnson, I also go by The Rock and you're probably thinking, 'Of course you by the name of The Rock because you have a head the size of a rock!'"
"Hyrum, I know! It's a thing, but it's not really important right now. What is important is that I heard you love a movie called Moana, which is crazy because I love that movie too," the actor says. "I also heard you watch Moana almost 10 times a day because the character you love, Maui, gives you strength."
The Rock goes on: "People tell me I kind of sound like him. I just wanted to send you a video to tell you how much I love Maui too. I know a little of his song."
He then sings the first few bars of the song, written by Lin-Manuel Miranda.
"I know you're like, 'Dude, leave the cool singing to Maui.' You're absolutely right, Hyrum. I wanted to tell you, man, stay strong. There's another dude out there, me, Dwayne, who, like you, loves Maui too. There's no one like Maui. He's the coolest thing. I'm a big fan of Maui, too, and I'm a big fan of yours. Thanks for inspiring everyone around you, including myself. Stay strong, Hyrum," finishes the actor.
This is amazing.
And as an extra sweet update on the story, Hyrum watched The Rock's video and loved it.
In a Facebook post, reposted by the actor, the little boy can be seen grinning from ear-to-ear after watching hearing his hero sing his favourite song.
The young boy's parents April and Rich said: "Hyrum watched it and laughed out loud to The Rock's head and every time Dwayne said Hyrum's name [he] pointed to himself and giggled."
You can donate to Hyrum's GoFundMe page to help his family with medical costs here.
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