My parents never got me barbie, but the small Polly Pocket toys with the little house set.
When I was like... 10 or something, I always had a story line where Polly had a party and catches her bf kissing some random girl, so she would (in a fit of rage) kill him (like telling him to fix the clogged bathtub and throw a toaster in it or choke him with dental floss or just any murder in the bathroom), then spend time in the bathroom cleaning blood and hiding his body in the tub and covering it with the shower curtain. Then I come up with stupid ways she would hide the body like... Cut him up and throw him into the sea or bury him in the neighbor yard or cooking him and feeding him to the dogs or etc...
I feel like a lot of my thriller plots come from the fact my family watched a lot of horror and murder films and I just.... Neat, I have no idea why those two people are naked and on top of each other, but man... murder is really dramatic.