I'm going to do exactly what I've done during the past 27 panics.
Not a damned thing.
I'm going to keep investing regularly, just as I did during all the panics and "crashes" over the past 30 years: 1987, 1990, 1992, 1997, 2000, 2001, 2003, 2008, 2011, etc.
For those who are old enough to remember the crash of '87, remember people were jumping off buildings? Look at a DOW chart today. That "crash" is a barely noticeable "blip" on the chart.
Damn it, if only I'd panicked (er, "market timed") and sold off during all those crashes rather than continuing to invest, I'd probably be millionaire today (instead of being a multimillionaire).