What is the purpose of this excerpt?

all of a sudden, i heard ear-piercing screams. my heart stopped beating. like all mothers who from another room hear a child screaming for an unknown reason, i feared the worst. i ran out of the kitchen into the living room, and i stopped short. i could not but laugh at what i saw. my son hung upside down from the couch where his shoe had stuck to the cushion with velcro.

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