Speak proper, why don't ya?

The blog about "Troubled Waters" has many other such anecdotes flooding back.
Did ya see what I did there, did ya, huh, huh?
I was on a course about "Children's Language Development". The question was asked
 "Should we only accept Standard English or is a child's colloquial language equally acceptable in their own environment? Are we in fact Language snobs?
Oops, what does that say about my obsession with apostrophes?
http://www.nols-agirlforallseasons.com/2011/06/getalife.html
One of the teachers recounted this story.
She was teaching Infants in an inner city school. As was par for the course, a puddle appeared on the floor mid-morning.
"Now children. Someone has had a little "accident". Who did it?"
Twenty six pairs of eyes stared up at her. No takers!
"Don't worry. You're not in trouble. We just need to know who it was  so we can get you cleaned up and changed. It can happen to anyone".
She looked at her charges again. One little boy's face turned red and began to crumble. The wail started
"Waaah! I done it Miss!"
She grasped the perfect opportunity to correct a very common grammatical error.
"No, that's not right. I did it".
He stopped in mid-wail, gave her a quizzical look and said
"No you didn't Miss. I done it".
Case closed!