I have no idea WHAT it was.
I was trying to launch Terminology from the ibar in E23. My cursor accidentally moved and almost dragged Terminology out of ibar. Next thing I know, there are like six Terminology windows open, and a Guru Meditation error is shown on the top. I tried to take a screenshot, but when I clicked the menu button it disappeared.
I have no idea what it was or why it happened. Is it an E23 thing?