Doubted What I Saw

The other day, I took care of my friend's two boys while my friend was away.

While the boys were eating individually wrapped chocolate, one of them said,
"I can't open this" and threw away the wrapped chocolate into trash.

I couldn't believe what I had seen and for a moment was at a loss for words.
Right after that, I opened it for him.
I don't know whether this is the modern day children's thing or not,
but I think this was only a reaction of him personally.