Note from dshort: I couldn't resist the urge to update the chart with the today's Friday-the-13th performance.
Incidentally, that top 2.66% gain on Friday, December 13th of 1929 was preceded by a Thursday decline of -5.92%. Still the Friday rally held the week's loss to a mere -4.04% and trimmed the loss since the 1929 high to -34.5%. Unfortunately this legendary Dow Crash would fall another 83.49% to rock bottom in July 1932.