the last 2 times i rode kingda ka i swear i suffered minor concussions
and also the worst trend set by an amusement park of all time i would have to say was Cedar Point's Corkscrew. once that thing went up more and more popped up everywhere until there was an army of neck breaking corkscrew rides
My last nomination is under the category of most painful ride outside of a water park. For this I nominate The Rotor at Lake Compounce. it is one of those rides where they spin you so that you stick to the wall and then the floor drops out except Lake Compouncs nefer spins it fast enough so when the floor drops you slowly and painfully slide down, causing large acrapes on your back.