Gap UP... close on Low, Gap DOWN.. close on Hi, Gap UP... close on Low

Saying that "This is not an orderly market..." is a gross understatement, I read a commentary today at sentimentrader.com;

To say we've seen some whipsaws lately is quite an understatement. Yesterday we got a gap up opening of greater than +1%, only to see the market turn negative on the day before a last-minute spike at the close. Now today we got a 1% gap down open, and what looks to be a positive close.

I cannot find another instance of this happening at any point in the past 15 years using the S&P 500 tracking fund SPY, or the past 25 years using the S&P 500 futures. If we relax the parameters a bit and look for gaps of 0.75% or more, then only one precedent pops up. That was May 27th, 1998, which led to another month of back-and-forth trading and no real progress either way. Like we saw with the huge gaps and reversals on January 22nd and 23rd, we're in mostly unprecedented territory with some of these price movements.