There kind of was at the Chicago St Pat's block party last year (where I was standing at least). the group I was around had some kind of vague group swaying thing going on that got much more lively with picture window, of all songs.
A mosh pit and/or group sway more lively with picture window? I was initially surprised that one would be attempted at a Ben Folds show...but to have one appear (mosh and/or group sway) to intensify during 'Picture Window' is even more unexpected.
It was, supposedly, the first time anyone had heard it outside of Ben and the band, and St. Pat's included 5 free drinks with entry, so...
Pretty sure that Underground got a little rowdy too.