It only takes a moment to change everything: a plan, a mood, a relationship, a life. Never take any moment for granted because in no time at all another moment will swing right on by, knocking you right off your feet. Disrupting life as you had known it to be, and leaving you to adapt; picking up the pieces in order to move on.
Overstated nonsense. If this were true, everyone would spend all their time being knocked right off their feet, and have a life which is in a continual state of disruption.
Most moments are normal, and deserve to be taken for granted.