Necro you are a god damned madman hahahaha I love it.
For those of you who don't understand what he did, basically merchants show up with a lot of expensive trade goods at your fortress every now and then. He lured them inside, then opened a huge trapdoor (technically he collapsed it) which sent them plummeting many, many feet down onto some spikes. From the looks of it, the merchants and their pack mules exploded. You can then see all the Dwarves come steaming in to loot their :bou::bou::bou::bou:. Did the animals in the cages survive?