The phone belonged to 12-year-old Aiden Smith. The video has since been viewed 1.2 million times.
Marchand, on Tuesday, reflected on a message passed along to him by Bruins great Ray Bourque about the fleeting nature of sports celebrity and the ways in which small gestures can mean so much to fans, after the pair met at a charity event when Marchand was 19.
"I'll never forget what he said to me -- I've come back to it a lot," Marchand said. "It's very easy… to forget where you're at, forget how fortunate we are, how lucky we are to be in the position we're in to be living our dreams and living other people's dreams. You kind of take it for granted at times.
"He said every kid that wants an autograph, every kid that approaches you or wants to talk to you, just remember to enjoy it, don't take it for granted. Enjoy those moments because when you retire, nobody cares anymore. Nobody cares about what you've done or who you are. You're not relevant, essentially, it's always the new players that are in the League, the superstars that are in the League at that point that they care about. People forget pretty quick."
It's a message that's stuck with him, that's allowed him to appreciate these moments, and appreciate those who are cheering for him and for the Bruins.
"I think it just keeps you grounded, keeps you humble, and makes you understand how fortunate, again, that we are," Marchand said. "That's coming from one of the best players to have ever played the game. When he's talking like that, it hits home. So I thought that was good advice to learn at a young age."