Well, concidering how the first anime series I watched in full was Neon Genisis Evangelion, marathon-style, off of 3rd generation copies, of dubs, I'd say that pretty much is the one that scarred me. That, and then the movie when I finally saw it.
From then on there's been little else that's phased me until I watched Speed Grapher. I never want to go to a dentist again.