It is well-known that as part of the S&P500's ascent to new records, investor margin debt has also surged to all time highs, surpassing for the past three months previous records set during both prior, the dot com and the housing, stock market bubbles. And as more attention has shifted to the topic of speculator leverage once more, inquiries into the correlation between bets upon bets and stock performance are popping up once more, in this case in a study by Deutsche Bank titled "Red Flag! - The curious case of NYSE margin debt." Of particular note here is a historical comparison of margin-debt warnings that have recurred throughout history but especially just before major stock bubble crashes, such as in the period 1999/2000, 2007/2008 and of course today, which have time and again been ignored. Here is what was said then, what is being said now, and what is ignored always.