I apparently got added to a group conversation called "
yeah Maskull has a hateboner for me" that I don't care about. Judging by recent posts in the conversation, others did too, and it has over 1000 participants. There is a "Leave" button, and clicking it pops up a dialog box with two options ("Accept future messages" and "Ignore future messages"), but no matter which one I select, the box doesn't close after clicking "Leave" in the box, and I don't actually leave the conversation. Popping open the inspector shows that the AJAX call happening after clicking the second "Leave" is resulting in a 500 error.