I had a decent flock or Barbies as a kid, but let's just say I didn't play "nice" with them after nine or so. I went through quuuuite the Barbie/horse torture phase from age nine til I had no more Barbies to fuck with. I'd rip the heads off and flush them down the toilet, shove them in the mud outside (remember shoving one in a mud puddle and pulling it up to find a dead worm it its hair. For some reason I cackled maniacally at this), "feed" them to my Jurassic Park dinosaurs (I'd always play games where a Barbie was some evil oppressor/enslaver of the raptors who eventually got her just desserts by way of being eaten alive), and I remember one time when I tied one to a tree and it stayed there for like, three months. It only came down when my dad was like "wtf is this doing here?" and got a step ladder and pulled her down, yanking her head off in the process. I of course thought that was funny as hell, much to my parents frustration.
I still have my main raptor pack, who in the end were the biggest toy "best friends" of my childhood. Especially my first one (the "Cyclops" raptor from the Lost World series), to this day I'd be devastated if something happened to her <3
I've wondered if my dollieh addiction now is retribution for all the Barbies I destroyed back when