How do people develop really specific kinks/fetishes? /u/GlitteringCaramel777 Sex

I’ve always been curious how people end up with these incredibly specific rare fetishes like I saw someone who was really into car keys or like certain clothing items just odd things like that

I’ve always been curious how people end up with these incredibly specific rare fetishes like I saw someone who was really into car keys or like certain clothing items just odd things like that