The 43-year-old "Batman v Superman: Dawn of Justice" star cheered the crowd by indulging in a nerdy moment and pulling out his phone to capture a photo, reported People.
"I've never done this before, it's kind of nerdy. It's just not going to happen again, it's kind of a cool moment for me," Affleck said.
The actor also talked about his new Batman movie.
"I'm deeply honored and thrilled to get a chance to do it. Thank you for giving me the opportunity," he said.