No never.
But I lock my helmet and stuff up on my bike when I'm at class or work.
I do enjoy watching my bike from a far, waiting for someone to walk up real close to get a look and then sneaking up on them and saying "what's up" in my most intimidating voice. Even when I don't feel like sneaking up on people, I watch my bike when I'm at school for a couple minutes between each class, just hoping to catch someone doing something stupid.
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