As markets head sharply lower in intraday trading Friday, Jim Cramer had a simple message for investors: "Sit on your hands."
All week, Cramer warned that September 17 marks the beginning of one of the rockiest trading periods of the year, citing chartist Larry Williams.
In addition to the calendar importance of the day, Sept. 17, 2021 also marks a quadruple witching hour - today, derivatives of stock index futures, stock index options, stock options and single stock futures all expire simultaneously.
"People have the least view of what could happen ever and yet there will be the most volume," Cramer said. "There are a lot of people on pins and needles here."
Recap TheStreet Live: Everything Jim Cramer Is Watching 9/17/21