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Nightmare Fuel: Basilisk
The idea behind Gennosuke and Hyoma's powers. Basically, they can drive you to suicide with only one glance at you. it's even worse in Hyoma's case as, for different reasons in each continuity, he cannot control it — there's a HUGE reason why he practically lives with his eyes closed.
Also, what Tenzen did to Kagerou. Not only he raped her when she was an official prisioner of the Iga, but when after recapturing her... he tied the poor woman up, got her blindfolded as well as topless, and tortured her via shooting needles into her bare torso, solely out of sadism. You know it's totally horrible when Oboro, the same girl whom Kagerou tried to murder less than an hour ago, stumbles into the torture site and pleads for him to spare the woman who wanted her dead more than anything.