A boat ran aground in the river behind our house. This was about an hour after low tide, and the boat was perhaps 40 feet long. From the looks of it, they were coming downstream and let the bow go too far to port. The bow stuck in the mud on the west side of the channel; the stern swung round and stuck on the other side; and there they were, sitting across the channel. Fortunately the tide was making, so in a couple of hours they were off.
With an immobile target like that, I did consider a bit of piracy, but capturing a grounded vessel obviously is a bit problematic as far as the "get away" plan goes.