The Home Run Derby winner's wife, Kayla - among others - brought this to the internet's attention.
Much of the night felt like a send-off from Harper to the Nationals fans.
MLB How can I watch the Derby on TV?
Aguilar, whose 24 homers leads the National League, will join teammates Lorenzo Cain, Christian Yelich, Josh Hader and Jeremy Jeffress in the All-Star Game on Tuesday.
How can I stream the Derby online?
With 24 home runs this season, Aguilar was the top seed and faced Philadelphia Phillies slugger Rhys Hoskins in the opening round.
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In the final, Schwarber came in just under his total from the semifinals with 18 homers and Harper started off his round slowly, but rallied late and got the tying homer with just a few seconds left.
Harper would go on to hit a HR Derby walk off with the title in his bonus 30-second round. Hoskins opened by blasting 20 homers, the highest number that had been hit to that point. He was greeted by a smattering of boos by Nationals fans but said he fed off the energy of the crowd.
Because we live in a world overwhelmed by a surprising amount of free time, there is already a Change.org petition to have Harper's victory taken away.
But on this night at least, Harper did not disappoint.
A few years ago Major League Baseball revamped the Home Run Derby format to make things more exciting and hey, it worked.
They will hope, however, that Monday night's festivities provide but a precursor to bigger things later in the year.