$SPY $QQQ $GDX I seem to recall the 1929 crash happened on 2 days. -11% on Oct.24 and -12.8% on Oct.28. Oct.28 is called black Monday. en.m.wikipedia.org/wiki/Wal... The 1987 crash was -22.6% in one day Oct.19. Following weeks of declines from early August after Kudlow advice to Reagan had FED keep rates low to trash dollars to cure a tremendous trade gap. Worst hit in 1987: GOLD stocks down -40% on the OPEN Oct.20.