Create a post, then as original poster delete it before a comment / reply is posted and it will lock up your browser (FF latest) with a script taking too long to execute error. You have to kill the tab.
Granted this bug only applies if you give up on solving something yourself and ask, then your problem solves itself, so you go back to delete the tread to not waste others time.
Also, the post will disappear, but it looks like it was not cleared from the DB fully as it won’t let me post this a second time (after verifying the bug by deleting the first one) unless I add text like I am now