Today in history:
September 3rd marked the top in 1929 following a furious rally fueled by wild optimism, excessive retail speculative behavior and markets disconnecting far above the fundamentals of the economy.

Pretty wild actually. Not sure if it means anything, but the structural similarity, despite all the differences in time and global technology is pretty impressive.

For added perspective: Long term trend regression analysis so you know it's not completely without merit to point out the extremes.