1. It will catch people unprepared

Matthew 24:37-41 (ESV)

^37  For as were the days of Noah, so will be the coming of the Son of Man.

^38  For as in those days before the flood they were eating and drinking, marrying and giving in marriage, until the day when Noah entered the ark,

^39  and they were unaware until the flood came and swept them all away, so will be the coming of the Son of Man.

^40  Then two men will be in the field; one will be taken and one left.

^41  Two women will be grinding at the mill; one will be taken and one left.