Mine has to be Son of Beast at Kings Island. The first drop is great, but the coaster is so horribly rough and jerky that I ended up with 3 bruises on my left side afterward. My teeth hurt, and so did my head and back, a definite ouch. For the next three days, Advil was my best friend. My conclusion was that this coaster was highly overrated due to the fact that it is 1- a fairly new coaster therefore everyone HAS TO ride it, 2- it's a "sequel" to a much better coaster, and 3- it's a record breaking (or shall I say back breaking) wooden coaster. Definitely not one I would recommend.
Try the Looping Star at Beech Bend in Kentucky! :(
If I was a Football Referee I'd have to toss a Flag on that Coaster for Unnecessary Roughness!