Brewed my first Imperial Stout and my normal brew process is to take whatever "schmoo" (don't remember who coined that word, but it's so appropriate) is left after I put 5.5 gallons into the fermenter and use it to make pressure canned starters. This time, I had about half a gallon leftover. I normally stick a coffee filter in a funnel and run the extra through it to get clear wort, dilute as necessary, and then can.
This time, though, the extra wouldn't even go through the coffee filter - just sat there.