Verruckt! It broke ASTM guidelines that already existed before it was built. Cool concept and "water coasters" are still being introduced and improved. There's a few on cruise ships even but they focus on a smaller undulating ride without a massive drop and the jets propel you along.

There was also New Texas Giant. When Six Flags put it in, they refused the manufacturer recommendation to put in seat belts. They were afraid of employees inappropriately touching people's junk when checking the belts. It has intense negative G loads, which led to an obese lady slipping her restraints and being fired vertically out of the train to her death. It has seat belts now.