Every now and then on Twitter, you'll see a call for a celebrity to send a happy birthday tweet to a fan. Something so small can mean a lot to supporters of the stars, but getting a serenade in-person might really send them over the moon.
That's what happened for one young man who met Anne Hathaway. The Oscar winner encouraged nearby spectators to join in on the song, making his day ... and making the day of everyone on the Internet who's seen his joy.
Check out his full reaction in the clip above, and look below to see his post on Twitter after meeting one of his favorite celebrities!