If you have one, question if you have a mental illness like autism. If you do have a spinner and autism that's fine. If you don't but you have a fidget spinner, you now do.
[spoiler]I saw a girl with a light up spinner yesterday, there's many reasons that shouldn't exist.[/spoiler]
[spoiler]Edit: spinners are made for people who have autism or ADHD, not for people who want to follow a trend. (I saw a few comments saying I'm ignorant, probably the way I worded it, but I didn't want to offend people who have autism.[/spoiler]
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To the counter, fidgeting is pretty common in humans. Giving them something to fidget with is just a logical progression. From a psych standpoint, it's actually quite possible that there are a lot of undiagnosed, high to very high functioning cases of ASD