Giving a 5-year-old boy, Miles, who is in remission from leukemia, the dream of being a Batkid for a day is touching people across the globe.
People turned to Twitter and Instagram, getting into the spirit of giving a boy, who has battled cancer since he was 1, a day to remember.
Even President Barack Obama retweeted the Make-A-Wish Foundation, the agency making the dream a reality, urging others to follow @SFWish. He also recorded a Vine message congratulating Batkid.
On Friday, through the efforts of the Make-A-Wish Greater Bay Area, 12,000 volunteers gave this "Batkid" an incredible day of dressing up as a superhero and rooting out evil and crime in Gotham City (aka San Francisco).
Police officers in Campbell put on bat masks, graphic designers created images of Batman floating over the Golden Gate Bridge, and three Harlem Globetrotters stood in a circle, pointed to the camera and wished Miles a great day: "Good Luck Bat Kid."
In a particularly funny tweet, Tony Michaels, a country DJ who lives in Fremont, said that Batkid helped an emergency landing in San Jose. An American Airlines flight did strike a bird about 6:40 a.m. Friday morning, and no one was injured.
"This wish stands out because it's not to meet a star, or an athlete or go to Disneyland," said Michaels, who has been tweeting a lot about #SFBatkid. "He's his own wish. He's not pretending. He's himself. That's awesome."
As for why so many people are volunteering to help?
"Eighty to 90 percent of everything is negative," Michaels said. "This makes people feel good. People can hold on to that."