A few people have mentioned that they destroyed Tangle (Jr) toys...
You do know, I hope, that you can click them back together if the curve pieces seperate. I'm not sure how else you can destroy one. I've got a textured one, a translucent one, a normal one, a glow-in-the-dark bit of one (came as part of the textured one as a 'DNA' type theme) and a fuzzy one. I pull them apart on purpose and sort them into colours and types. Sometimes they become a bit loose and come apart more easily than before, but generally I've found it impossible to destroy them. I messed up a fuzzy one by putting it in my bottle of water, the fuzz disintergrated.
Toys, including fiddle toys (or stim toys or fidget toys, whatever name we give them) are my raging, long-lasting special interest and have been for years.
Other fiddle toys:
'Haba' brand baby toys, sometimes you can get a block-colour wooden object, that doesn't look entirely babyish (no faces or animals etc). I desire these very much. I own a few. Here's a link to my favourite: http://www.amazon.com/Haba-1296-Trix-Toy/dp/B00000J4XU
I also go to the local toy shops and look at the small toys and find a few bits. I have 'catapillar' toys, which are small wooden cubes attached in a line with strong, tight elastic but they can bend into different shapes.
And a Koosh ball. Also I was given a pen-top fiddle toy, wallace and gromit branded. Link: http://www.shopwiki.co.uk/_Wallace+and+ ... =365243530
I generally dislike the rubbery toys, because they make my hands smell of rubbery stuff and feel slightly greasy or sticky - something I general dislike -I wash my hands frequently.
At the moment I like my Toy Story 3 'Chunk' mini figure, with a face that spins.