Hmm...
Pretty much all of El Toro - the insanely fast lift hill, the drop, and the bankings which feel pretty much like a condensed second half of the Ultimate.
The Ultimate's second half, going over the second lift hill and down into the gaping maw of the trees below, before... well, why spoil it?
Wild Mouse at Blackpool Pleasure Beach. The only coaster where I actually feel I may get decapitated.
Joker's Jinx - how? Why? What?
Grand National at Blackpool Pleasure Beach - the final drop, just where it looks like you're going to run into the path and you drop under it.