So I agree with everyone else who has named serious special interestes like Paedophilia, Beastiality, Rape and Necrophilia.
I would also go on to include Snuff, Physical violence and Genital Mutilation (both the act and the specific special interest for it).
Outside of criminal acts, I greatly dislike;
Scat
Vomit play
Guro
Vore
I would probably remove one of those if not any of the criminal ones.