Dragon Khan at midnight always gets me, specifically the part exiting the loop and entering the dive loop for some strange reason, however, I never get close to blackouts on the most insane element of the coaster, the Zero-G Roll. Maybe it's the pullout force at the bottom of the vertical loop; I don't know but I always see a tunnel of light fading in and away :?
For unusual extreme rides; I never find Fabbri Boosters to be "intense", but I went on one alone today (I've never been alone on this), and two adults were on the opposite side behind me. As it rose up to the highest point I was forced onto my back due to the difference in balance, and it kept me at the top angled about 40 degrees facing the sky, which felt bizarre and frightening. As the ride was going round, I was inverting backwards insanely forcefully and manuevured this more than twice a complete rotation :shock: I came off shaken up due to how intense it actually was on that ride.