Look what happened when I opened the lid of the barbecue this morning. I accidentally created a spiderling string.
They dangled down from the handle onto the grill. I left the lid open so they could sort themselves out.
Later, I found they had re-massed beneath the handle. As I tried to focus on the little golden spider-ball, a signal was sent and they immediately dispersed, like commandos rappelling from helicopters.
Later, I found they had they climbed back up again and resumed the ball formation. I decided to leave them alone. They've had enough action for one day.
For more arthropodan awesomeness, see Edition 3 of An Inordinate Fondness, as gleamingly presented at Fall To Climb.