It took me a few moments to realize that the flies were being shuffled into a can rather than mechanically chopped to pieces by the rotating fins. So you end up with a can writhing with live flies! And yet there is still no screen version of Iain Banks' The Wasp Factory. [via]
It (or something very similar) is available on Amazon for $15. Here's the provided guide to "attract flies."
Fish is the best.