Melted ice cream, children, is a fluid that is eternally sticky. One drop of it on a car-door handle spreads to the seat
covers, to trousers, to hands, and thence to the steering
wheel, the gearshift, the rearview mirror, all the knobs of
the dashboard-spreads everywhere and lasts forever,
spreads from a nice old car like this, which might have to
be abandoned because of stickiness, right into a nasty
new car, in secret ways that even scientists don't
understand.
What is the author's purpose for including this portion of "How to Eat an Ice-
Cream Cone"?