How John swapped steel plates

John was working for a utility company. One day they were burying a cable, and needed to temporarily cover an excavated pit. To cover they used what you might have seen and probably driven over - a large steel plate. John was a foreman at the site, and told his backhoe operator to start lowering the plate into place.

Except John was a diligent foreman. He liked to do things perfectly. He wanted to be sure that the steel plate would sit well over the outline of the excavation, not wobble, and not crumble asphalt and rock onto the half-finished cable interface. Just as the plate was being lowered, he decided to sneak one last peek under the plate. Except the backhoe operator was not so experienced at fine controlling the lowering function, and lowered the plate by too jerky of a motion, which squashed John the Foreman's skull. As John recollected, after almost a year in a wheel chair, and partial memory loss, the split second he felt the weight of the plate was like the worst headache, except being inside his skull bones. John is 80% normal now. He cannot drive, concentrate, remember complicated information, and has a high-tech, combination stainless steel-titanium plate replacing most of his skull dome. The upshot of it, he has not needed any psychological counseling. He doesn't remember the details of his stupid decision to regret the whole episode.