Last time I did a bug hunting session, this happened... for three pages of the Bug Reports section... http://secretsofgrindea.com/forum/index.php?attachments/upload_2015-12-30_23-22-33-png.1207/
HOW EVEN. Dude. I couldn't find any. Then again, I'm terrible at bug hunting; usually I just run around doing whatever until something weird happens.