My first drop tower experience was Apocalypse at Drayton Manor, about two days after my first CFLive, with Tom, and I was bricking it! I was still at the stage of not wanting to open my eyes on Nemesis, and I was going on this tower-thing. I've never been brilliant with heights, and especially when i'm quite exposed, so going on the stand-up floorless side of Apocalypse was pretty scary, even afterwards!
Still to this day, drop towers are the thing I find scariest. Its the whole exposed feeling that adds to that thrill for me, and that's great, because very little does scare me anymore!
Looking at Kebab's experience of Hurakan Condor, I can completely understand that feeling though, apart from the fact I never rode it! Sadly (no, really), it broke down the evening we were there, so I never got the chance, but jesus it looks scary!