It hurts to imagine stuff. It can give you a headache. Probably doesn't hurt physically, but it hurts mentally. But the more that you can do it, the more you're able to get out of it. Everybody has that capacity, but I don't think everyone develops it.
Stephen KingOnce, during the drinking phase, Wendy had accused him of desiring his own destruction but not possessing the necessary moral fiber to support a full-blown deathwish. So he manufactured ways in which other people could do it, lopping a piece at a time off himself and their family.
Stephen King