I've seen it a couple of times but can't find any information about it. Has it got anything to do with Brussels or https://news.ycombinator.com/item?id=11333402?
The latter (it's been there for many hours). See also <a href="https://news.ycombinator.com/item?id=5990015" rel="nofollow">https://news.ycombinator.com/item?id=5990015</a>, <a href="https://news.ycombinator.com/item?id=11333686" rel="nofollow">https://news.ycombinator.com/item?id=11333686</a>.