Here's another. After working in Ads for a while somehow I convinced senior management to let me use all the idle cycles in prod. I spent the next three years building and running the equivalent of Folding@Home at scale (the largest number I'm allowed to share is that we used more than 700K Xeon cores 24/7 to run protein folding, drug design, and telescope simulations). We published a few high profile papers and then I shut down the project because it was using far too much energy and it made sense to free the resource up for more important projects.