"After each snippet, the group would give it thumbs up or thumbs down.
Thumbs down meaning it's evil and thumbs up meaning it's good. We
generally judged by whether we would want to use this technique for an
actual production system.. it's a sign of success if you get all
thumbs down in my opinion :)...
When we have an evil talk, we dim the lights. When we have a "for
good" we turn the lights back on. It adds to the atmosphere."