Fun fact.. I was plotting the MACD divergence prior to each crash and get the following:

558
470 (.84) $3,000 --> $1700

1325
1164 (.87) $5000 --> $3000

1992 (.86) $7500 --> $5400
1715

3023
3735 (.80) $ 11800 --> ?????? (Where we are now)

In each preceding crash/pullback we were around .85. We are currently at .80 without a 3 day MACD cross over since the $5400 drop. So I'm thinking this one will be particularly interesting.