Showing Some Restraint?

6 year old sits at kitchen table, humming a tune as she draws her picture.  Suddenly she stops and yells, "WHAT THE!"

Father and mother are not sure how to respond to her outburst.  Should they applaud their own restraint because she does not know to use an explicative at the end of her phrase?  Or should they work on their own demonstrative behavior when things don't go quite as planned?  Nope, they laugh out loud, because there is nothing quite so funny as the 6 year old's reaction to her own inability to draw the eyes just so.