Oh god yes. A few years ago some labmates and I discovered that a post doc had set up an entire computer cluster of 30 workstations / associated infrastructure,

Oh god yes. A few years ago some labmates and I discovered that a post doc had set up an entire computer cluster of 30 workstations / associated infrastructure, colocated it at a data center nearby, then left without leaving any documentation. Everyone that knew the cluster existed left soon after, and so labmates that arrived later were running simulations on their personal laptops while this cluster sat idle. We discovered it only because my PI received a large bill for rack space and remembered it existed.