At Monday’s inauguration, Barron Trump, the 6-foot-9 first son, captured attention not just for his towering presence but for a mysterious and brief interaction with Joe Biden that sent the internet buzzing.

Accompanying his father, Donald Trump, who was sworn in as the 47th president of the United States for a second term, Barron showcased his reserved yet commanding demeanor throughout the event. Now 18 and a student at New York University, Barron stood alongside his mother, Melania Trump, and his older half-siblings in the Capitol Rotunda.

When introduced by his father, the former president took a moment to highlight his youngest son, saying, “I have a very tall son.” The crowd erupted in cheers as Donald Trump credited Barron with offering key insights on the youth vote during the campaign, stating, “He respects them all and understood them very well.”

The young man, now taller than any member of the Trump family, smiled and waved to the crowd, soaking in the energy of the event. Yet, it wasn’t just his imposing stature or poise that caught everyone’s attention.

The moment that sparked online intrigue came shortly after the swearing-in ceremony. Barron briefly separated from his father to approach outgoing President Joe Biden and former Vice President Kamala Harris. Demonstrating impeccable manners, he extended his hand to both, exchanging a firm handshake. But what followed next left the internet ablaze—Barron leaned in and whispered something into Biden’s ear.