"I just thought to myself, 'I'll never get this opportunity again in my whole life,'" McKenna told the Pioneer Press.
It was that reaction that turned McKenna into an instant sensation.
"My phone started blowing up," father John McKenna told the Pioneer Press. "It died, like, instantly after it happened. We had friends from all over reaching out, I couldn't believe it."
McKenna, a seventh-grader at Derby Academy in Hingham, Massachusetts, posted the selfie to his social media accounts and has already gone viral.
The McKenna family flew into Minneapolis around noon on Sunday and had plans to fly out first thing on Monday morning, but those plans may already have changed.
“It’s been so crazy,” McKenna said. “I don’t even know what to think. All my friends have been texting me and stuff. It’s insane. I’ve gotten so many notifications, I’ve got like 36 Snapchats, like 21 DMs, and like 150 follower requests on Instagram."
McKenna was born in Greenville, North Carolina, and his family ran a boat business as they lived in New Bern, North Carolina, before they moved to Boston in 2013, WNCT reported.
Related: Dilly, Dilly: Free beer for Philly | Rob Gronkowski noncommital on return to Patriots after loss | Photos: Celebrities at Super Bowl LII | Photos: Eagles beat Patriots to win Super Bowl 52 | Pittsburgh man has been to every Super Bowl ever | Best, worst Super Bowl LII commercials