A college buddy of mine and I used to do DFCs all the time with a pen and a bottle of white-out. This was back in 1983 or so. I was surprised years later to find out that people were doing this on the Internet. I guess there really are no original ideas.
My folks didn’t go to many movies, and I had t explain a comic to them, from the strip “Born Loser” In it a guy is in a restaurant and the waiter says their evening special is fava beans, liver, and chianti. He books it out of there. My folks didn’t get the joke.
My impression was it was referring to the guy who raced a steam shovel to dig a hole through a mountain for the railroad. He beat it using just his hammer. This would be him later in life with a delicate little hammer doing detail work.
Don’t remember his name but assumed it was John Brown based on the comic.