The quest "Repurposed Technology" has you destroy harvest collectors in order to reprogram them into defensive mode. I couldn't reprogram harvesters that other players had destroyed, so I went to Stormwind and took out my ancient Gnomish Universal Remote on the off-chance I'd be able to reprogram a harvester destroyed by other harvesters -- and I could! Finally, some use for that trinket. Fun way to do this quest. I had to wait 3 minutes for the remote (and Vanish) to cool down, so this only shows one harvester being reprogrammed, but they all were about the same.