Our son had only heard his grandfather pray at Thanksgiving, Easter, and other special occasions; when he typically said a long prayer over the food.
One night, after a fun camp-out and fishing trip, grandfather (to our son's surprise) asked a very brief blessing on the food. With a gleam in his eye, our son grinned at his Grandfather and said,
"You don't pray so long when you're hungry, do you, Grandpa?"