10 Worst days in Dow Jones History.

Rank	Date	% Chg
1	12/12/1914	-24.39
2	10/19/1987	-22.61
3	10/28/1929	-12.82
4	10/29/1929	-11.73
5	11/6/1929	-9.92
6	12/18/1899	-8.72
7	08/12/1932	-8.4
8	03/14/1907	-8.29
9	10/26/1987	-8.04
10	7/21/1933	-7.84