With a stern voice....

and disapproval in my face, I marched through the door and asked:
Onyx, I sent you outside to pick up the toys that need to be brought in the house. Why on earth are you not doing it?

He could see I meant business.
He looked up at me, silver plastic sword in hand and timidly replied:

I saw a butterfly and I wanted to chase it. I got distracted.

Oh.
I wanted to scoop him up and keep him just like that for long long time.
Alright then. Carry on.
My 5 year old boy. Of course, you saw a butterfly and you wanted to chase it.....