For example: "Looking back over the 20-year period from Jan. 1, 1999, to Dec. 31, 2018, if you missed the top 10 best days in the stock market, your overall return was cut in half. That's a significant difference for only 10 days over two decades!"
And listening to people who would that "person X" winning would be catastrophic is empty rhetoric.
Some other good articles on the perils of market timing: