My sister had a funny octo story....
She took a can of sardines down to lure an octo out of his hole. She opened the can just enough to let the scent out. She placed it just out of reach of the octo, placed one of her strobes on the sand for some backlight and waited. The octo kept reaching for the can, but couldn't quite get it. It sat and thought for a bit. Suddenly two arms reached out, grabbed her strobe and started dragging it into the hole. My sister freaked, grabbed the strobe and started having a tug of war. Unknown to her, two other arms, taking advantage of her "distraction" reached out, grabbed the can, dragged it into the hole. Once the can was safely tucked into the hole, the octo let go of the strobe.
Once my sister realized how she had just been outwitted by a mollusk, she wasted several hundred pounds of air laughing at the whole incident.