The 30th anniversary of the 1987 stock market crash, which saw the Dow lose 22.6% in one day, comes amid investor concerns of steep valuations and correction fears as U.S. stocks continue to score record highs. A repeat of "Black Monday" is unlikely to happen today due to modern trading technology, implementation of circuit breakers and the way investor funds are managed, yet cautious traders refuse to rule it out.

When I voiced concern, my husband said, "Don't worry, it'll come back."