I was. The ghosts... made us see our worst nightmares, and made us believe they were real. A lot of people panicked, and a few even attacked other people. One of my friends was not affected, or at least not affected enough to lose track of reality, but those lucky ones were a minority.

It started on a... Thursday? Friday? And it ended the next Monday. We caught many of the ghosts responsible, but I have not heard of any of them causing that sort of hallucinations since then.