Thanks to a kind redditor and a costume he happened to have, a little boy battling cancer got to meet his hero.

In the Pics community, Reddit user IlluminX90 shared images of a very special experience—he dressed as Spider-Man to surprise Parker Loudermilk, a 2-year-old who’s been diagnosed with a rare and aggressive form of childhood cancer called alveolar rhabdomyosarcoma. A friend of Parker’s family knew the Ohio toddler loved the crime-fighting superhero, and asked the redditor if he would make a special appearance.

IlluminX90 described the meeting as “one of the best experiences of my life.”

According to the redditor, the family was told Parker has only days to live. Tumors have grown in his face and throughout his tiny body.

Online strangers have rallied behind him, posting messages of hope to the Facebook page Fight For Parker.

Of the experience, IlluminX90 wrote, “Never has a little smile impacted me so much.”

Another redditor wrote this:

See the full discussion in the original Reddit thread.