I have watched 2,500-3,000 (at least!) baseball games on TV over the past 40--plus years. But I've never seen or heard of this. I didn't see this major league game between the Braves and Mets, but I came across this video on a web site.
Even though many of today's bats have concave ends, that is one strange feat! I'm just surprised that it didn't involve the Cubs.