On Friday, Philadelphia Phillies left fielder Aaron Altherr hit an inside-the-park grand slam against the Washington Nationals.

It almost didn’t look like it was going to happen; Nationals center fielder Michael Taylor dove for Altherr’s drive, but completely missed. The ball skipped almost all the way back to the fence, allowing enough time for a grand slam.

The play was the first of its kind in 16 years.

But that wasn’t all. Altherr homered again in the fifth inning, and his night became even more rare.

(Thanks to MLB for the video.)