Welcome to Little Gitmo.
Mister Boo has had surgery to remove a bladder stone, his second trip down this surgical path, and the stone was apparently so rara an avis that the medicos have shipped it off to a university for further study.
Perhaps through their labors Boos of the future will not suffer from this malady, and the subsequent isolation it requires.
I’ve tried consoling him by noting that he, unlike Prince, is at least on the proper side of the lawn. But The Boo was never much of a “Purple Rain” kind of guy. Right now he’s happy to be making yellow rain.