I don't know if you can teach them - but well, here's a cat story:
My friend and I hanging out drinking water (real real hung over) and the cat just staring at us. My friend sets his water down, and the cat walks over to it, wraps his paw around the glass to the other side, and bites the edge of the glass. It was the wierdest thing - he actually tried to take a drink like a human would.
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