Mulholland Madness at least has Fastpass, so you can avoid the wait to some extent. I think it's the scariest ride in the park because of all those sharp turns - you know that if the car comes off the track you're going to die. Strangely enough, Primeval Whirl at Animal Kingdom doesn't bother me - probably because the spinning distracts me from the sensation of the sharp, un-banked turns.