KingDa Ka at SFGAdv 
  
http://www.rcdb.com/id2832.htm 
  
it's the suspense of that launch, you always feel like your ready you have an hour to prepare yourslef in line but your nerves are gonig crazy! then when you on the ride all the subtle things that signify the launch scare me S**tless, the brakes fins, the tran creeping backwards jsut a bit, (then if it's running with it) The horn which the coaster doesn't launch exactly on it is the scariest 10secs of my life. Your never ready.