Six-year-old Luis Noel was so excited to see Coldplay in concert that he skipped into the stadium.
Then, when the band's ballad Fix You played, he burst into tears.
Luis Noel was at the concert in Mexico City on April 19 with his dad, Luis Vazquez, and his mother Sandra Alonso.
As father and son belted out the ballad, Sandra recorded Luis Noel becoming so emotional tears streamed down his face. His dad gave him hugs and kisses to comfort him.
Once they got home, Sandra and Luis decided to post the video to YouTube, to raise awareness of autism and share their son's moment of emotion with the whole world.
Soon, it gained more than 1.8 million views.
In an interview with Mexican newspaper El Norte, Sandra said her son was so excited to see Coldplay the family travelled several hours to Mexico City from their home on Mexico's south east coast.
And, although he was crying, she says he loved every second.
"He wanted to go. If he didn't we wouldn't have," Sandra said.
"Luis Noel has taught us many things. We try to help him succeed for the day that we are not here.
"I was very moved when I saw him cry. It's not the first time he's cried when listening to a song. He was very touched."
Coldplay were touched, too.
The band posted the video on Twitter and gave their biggest fans Luis and Luis Noel a mention.
"This kind of thing makes it all worthwhile," Coldplay wrote.
This kind of thing makes it all worthwhile https://t.co/dy8Vm9naxh; Hola Luis y tu hijo hermoso! love cgwj&p;
— Coldplay (@coldplay) April 22, 2016
"Hello Luis and your beautiful child. Love cgwj&p;," they added, signing off with the first initials of band members Chris, Guy, Will and Jonny.
Luis responded: "Starting to believe in magic."
Since his first video gained so many views, Luis has since shared a second clip from the concert on YouTube, with the hashtag #autismrocks.
In the video, a beaming Luis Noel jumps up and down as Coldplay's A Sky Full Of Stars echoes around the stadium.
The videos have prompted thousands of people to contact the family and share their own stories.
In a post on Facebook, Luis thanked everyone for getting in touch.
"Thank you for all your support," he wrote. "This is global."
This story was originally published in April 2016.