Canard Petard

Written for contest. Prompt was canard.

The boy had sold them all the tallest tale.
As whoppers go this colossal canard
Created such a search as for a grail.
And then the boy perished in his petard.

He told them all of this bodacious beast
That killed and carried off small Sally Sue
And in the morning mist had a fine feast.
He chased, he said, until the truth broke through.

A cloud covered this teeny tiny town
And searching parties scanned throughout the wood.
The boy had helped small Sally Sue to drown;
The corpse found in the river where it stood.

The simple souls believed the boy possessed
And drowned him too, while on his chest they pressed.