By Jessica Derschowitz
Updated June 09, 2016 at 12:00 PM EDT
Credit: Angela Weiss/Getty Images

Even Batman knows the value of having a best friend.

In honor of Wednesday’s National Best Friends Day , Ben Affleck honored his own BFF, Matt Damon, with a collage of photos posted on Instagram.

The snapshots appear to be from a birthday party for Damon that ended with Affleck getting his face smashed in the cake. Affleck captioned it with an endearing, “This guy.”

Damon and Affleck recently celebrated their longtime friendship when they accepted the Guys of the Decade prize at the Spike Guys Choice Awards. That honor comes almost two decades after the pair’s 1997 hit Good Will Hunting, which first thrust their friendship into the Hollywood spotlight.

Damon and Affleck, BFFAE.