Oh I don't mean try to find the bottom! I mean try to find when something seems to be happening purely out of emotion, as in a stock going down for no discernible reason short of a weird investment environment I.E. FB and all its bad press post IPO and CITI pre-bailout
Finding the bottom doesn't matter, that's impossible so don't even think about that. Just say "the market doesn't seem to be operating rationally today, I'll bet against it"