This thing moves and makes all kind of crazy noise. What the heck is going on here?
Well, there are worse vibrating things he could be barking at, so at least there's that.
Via I Can Has Cheezburger
My cat used to do this with totally non-moving things like hairbrush handles. He'd whap at them with his paw to kill them. I think they looked liked lethargic snakes to him. He was terrified of my keyboard wrist rest - it was a huuuge snake to him.
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