For "extreme" and a total mind, well, you know, I would say Twilight Zone. I've been on it dozens of times but the whole dead garden area leading up to the cobwebby lobby and then into the library (where people still think they are going to drop) and then to the boiler room which is freaky and then into the actual elevators, then up, then up, and then...... well, you don't know what you are going to get - it's like a box of chocolates. This attraction is so good that when I couldn't do the thrill rides because of a neck injury, I still did everything here except the drop.
For a true mind blowing experience, Twilight Zone gets my vote all the time.