During the War of the Sisters:

“Behold! I am Gelasmandius the Mightly Awful! Thou hast said many a terrible insults and various unpleasantries! For such impu….impu..somethings, I challenge thee to a wizard’s duel! Have at thee! Abraca-pocus!”

Jester Pied - that is Gelasmandius the Mightly Awful - threw the sack that had laid over her back at Auric Starcast. On impact it erupted over his face covering him in thick layer of a white fine powder. He stood there caked in the powder stunned, his spell momentarily broken. Within seconds he erupted into a fit of sneezes whilst the remaining runes of his spell shattered. Jester Pied, opening one eye from a prone position, comically remarked "Did I win?" at which stood confidently. As he basked in her victory, her nose began to twitch. The white powder had suspended itself into the air after the impact. A chorus of sneezes soon ended their duel as she followed Auric's lead.

This is what was needed. It had worked. The powder was a sneezing powder. The two forces on the either side of the valley now stood quite. Their cries of war dispelled. Nightmare Moon and her unicorn forces counter spells began to evaporated, shields were lowered, and spears and swords were still. The two forces watched as Auric now laid curled up in the dirt still sneezing, and Jester Pied was propelling through the air with hers. The silence was broken as somepony giggled and laughed.

Both sides now were laughing their misery out. The decades of war bottled up. It was all reduced now to beautiful sound of laughter from both sides. The forward ranks mingled with each other, exchanging gifts, messages. It had all come to past for them. A pair of eyes drifted upward to the regal form over head. Nightmare Moon was surveying the field, not in preparation for battle, no in relief, but her relief was only meet with remorse for she was alone in the sky. Only in this blissful moment did the the moon fill the sky.

Those pair of eyes left her and settled back at the lines. But no laughter escaped this pony's mouth. No only a smile. It was perfect. Let them laugh he thought. Let them unwind. He stood there silent and still infront of the doorway. No pony saw the doorway, nor did anypony paid any heed to this strange pony in the the armor of the solar troops. His smile grew with each passing minute...a full twenty minutes.

The twang of crossbow was dulled by the continued laughter and merriness. But then silence shrouded the valley. On the opposite side of the field a Lunar infantry pony's shield had an arrow embedded in it. The hat of Jester Pied tangling from the bolt's shaft.

The door shut and vanished from existence in the Whisper Valley. The silver hair pony tossed the armor to the side and drop the crossbow beside it. Another door reappeared on the crest of a nearby hill. Walking out, still smiling the pony look down on the valley... and the fray within it. "Hmm, let's see... A lake over here perhaps, needs a damp...AH Discord Beavers. Wut - Discord Beavers?! Need to make a note of that....maybe a hotel or two, YES facing the south. A splendid view..."

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I think this is a proper used of the term, head-cannon? Anyways a little contribution to Ask Nightmother Moon ( http://ask-nightmother-moon.tumblr.com/ ) operated by  anaktis Go read the full story. This is a tangent to it

Art :  m-p-l
Jester Pied Auric Starcaster and story arc :  anaktis