so being smarter than the average Joe means buying high and selling low ?
You've got to realise Vanguard (and other funds) trade with other peoples money ... so they're probably not that concerned.
Speaking of smart moves ... I wonder how the person who went short 2m shares last Friday is feeling now ? ... not too clever I would have thought, and if they haven't covered yet we are in for one hell of a move up when they do.