No one can predict the future and it's not likely most of us will know when the next 'stuff hit the fan' scenario will occur, but we can make some educated guesses based upon experience and common sense.
For example, for much of the country – especially the Midwest – we are approaching tornado season, when spring and early summer weather can often turn violent. The same is true for the Atlantic coast and the Gulf of Mexico, which could see hurricanes in a few months.
Out West, especially in California, there is always the threat of a major earthquake, though the New Madrid fault, the epicenter of which is located in southeastern Missouri/northwestern Kentucky, is also a threat.
Then there are world events which could erupt at any moment, such as a nuclear attack, or a cyber attack on our financial infrastructure. Or maybe political violence stemming from the insanity the political Left still harbors over the election of Donald J. Trump to the White House.