Los Angeles-based photographer Daniel Oh shared on social media that while conducting a photo shoot at the Griffith Observatory, the group saw the School of Rock actor, 51, who agreed to join in for a shot.

A post shared by LA PHOTOGRAPHER • DANIEL OH (@visionarydaniel).

The Tenacious D singer then crouched down in front of the grads, in their blue caps and gowns, and flashed a rock 'n' roll salute.

A post shared by LA PHOTOGRAPHER • DANIEL OH (@visionarydaniel).

The 18-year-old photographer wrote on Instagram that he and his subjects "graduated from the school of rock 🤘🏻.".

Black has 164 credits to his name, but one of his most famous roles ever was 2003's School of Rock.

It saw his character, Dewey Finn, get booted from his rock band and scams his way to a substitute teacher gig at a prestigious prep school.

Black has appeared on tons of red carpets since his Golden Globe-nominated role in School of Rock, and he just doesn't take a dull picture.

Jack Black schooled some young graduates on finding the best light.

Los Angeles-based photographer Daniel Oh shared on social media that while conducting a photo shoot, the group saw the "School of Rock" actor, 51, who agreed to join in for a shot.