This is a video of an anvil shoot a few years ago. Wait for it…
Yes, that was an anvil flying through the air. The video was taken with an old flip phone. I said it was from a few years ago.
Basically one anvil is placed upside-down in the ground. Black powder is placed in the cavity of the base. Another anvil is placed on top (right-side-up) so the anvils are base to base. A fuse is set. Light the fuse and run.