It's the reaction that every gift-giver dreams about -- no thank-yous or polite smiles -- just pure, unadulterated joy.
Daniel Buckhannan was lucky to see just that on his father's face, after handing him a surprise gift. Don, the elder Buckhannan, reacted with delight after receiving what he thought was a black fedora for Christmas. But when Daniel told him to look inside the hat, Don was flabbergasted ... then elated ... then in tears. Watch his whole range of emotions in the video, above.
And what exactly caused this viral-worthy reaction? Tickets to the 2013 Discover BCS National Championship, a college football bowl game, between the Notre Dame Fighting Irish and the Alabama Crimson Tide.
The YouTube video, uploaded by Daniel, has seen more than 3.6 million views since going online Sunday.
What was the best gift you ever received? How did you react? Tell us in the comments below.