Not childlike, but childish

The cute little boy and girl were hiding under the staircase when I
entered my building. With a tense look, they signalled me to move on
and I did so politely. After taking a few steps, I turned back to
see another man entering through the door.
"Baaahhhhh," the children screamed at him.
"Ooofff..," the man acted as if he had been ripped apart by fear. Typical innocence writ large on their face, the children ran with glee and laughter.
My mobile tone interrupted my thoughts. "I will be at your home in 10
minutes," declared my nephew.
"Why not play the joke on him?" I told myself.
Eight minutes must have gone by.
Klinggg…the door bell rang.
The corridor lights were off. I saw through the door peep hole “my nephew” with a bag. Well, my nephew must have brought some gift pocket! Wow.
I clutched the door bar and with a sudden jerk screamed bahhhh…
The man threw the plastic cover in his hands and out went sugar and
rice, spilling all over the corridor.
What's wrong with you? he yelled. The grocery delivery man.