You first walk through the produce department for the onion, then on to the bakery department. Then you meander up and down the isles, searching for just the right box of cereal....slowly moving, searching all the shelves, weaving back and forth in an effort to avoid a head-on collision with the other shoppers.
Suddenly, out of the blue, unexpectedly (redundancy is good) the cart stops! You are flung against it, your body doubled over the handlebar. The surprise throws you and you almost lose your breath. You shake the cart, try to move forward again and...nothing. You try to move the cart backwards, then forwards and...nothing. Your blood pressure rises and you start to sweat, to swear, shaking the cart, bouncing it up and down and...nothing.
You bend down to examine the front right wheel and find a little piece of celery has lodged in the hub....lean down and pluck it out. You stand, smooth your clothing, look around and smile at the other shoppers, then continue on your way.....
How many things every day take us by surprise and we immediately react as if this was the biggest deal in the world...only to find it is simply a small piece of celery lodged in our hub that really only takes a plucking out and moving on.