A rare perfect screw extraction, on a conveniently large lag screw, that was soft and easy to drill, and that also looks like it could've been done with vise-grips anyway, if this were an ad for vise-grips, and not for a screw extractor.
Bone screw with opposing threads - photo
Correct way to drive a screw - GIF
Giant ground screw - photo and video
Deck screw box with built-in deck board drilling template - photo
1871 automatic screw-making machine - video and photo