Hi there. When I am watching man hanging scenes, their trembling on noose and struggling I am having erection and ejaculation. Is ti normal?

Normal is sort of a meaningless word. Strictly speaking, it means the mathematical norm of a given group.
Is it something to be concerned about? I would be concerned, even though many of us have fantasies about violence as a way to cope with anger and frustration, and it often happens during dreams, masturbating, looking at pictures/movies, or reading. What matters is whether or not you let it obsess you, and carry over into daily life.
IF you get to the point of craving such scenes, then you need to see a therapist, to explore where this might be coming from in your life. Perhaps in childhood something happened that affected you.

Thanks for an answer. But it only happens when I am watching hanging scenes, not beheadings or other cruel things. I don't get an erection during watching other scenes.

Thanks for an answer. But it only happens when I am watching hanging scenes, not beheadings or other cruel things. I don't get an erection during watching other scenes.

Everybody has a fetish they think is not normal. It seems to be normal for you though, so don't worry unless your fetish makes problems in your life.

Do you have a secret collection of hanging scenes/movies you pullout to get off on?