"Draco Dormiens Nunquam Titillandus"
It is a pity James Sirius Potter was never credited for his wisdom.
In a typically cold and dreary morning, a little boy, no older than eleven years old, walked into a deserted, but clearly old, Great Hall. The boy's history may just had been starting but that place, not just the Hall, the whole castle in which was located, had already seen much. Thousands of wizards and witches sat in those bends before growing up to do great, terrible or otherwise ordinary things. In there, dramas unfolded, happiness was found and death was witnessed.
Through all the history that the hall had seen, never once did the school actively participated. The candles that floated above the tables never shimmered differently nor did the banners on the walls showed any sign of life in its history. Most importantly, the school's insignia with its motto carved on the floor never once changed. Until the day that little boy came, that is.
What made him different from any other kid that graced those halls was his ancestry and name. Every human being is born with a modicum of wisdom, even if sometimes it is hidden so deeply that nobody will ever claim to have seen it. The Potter and Weasley families, however, had showed in its latest generations an exponential decrease. James Potter Sr. still had it, even if he sometimes decided that it was a brilliant idea to paint Minerva McGonagall pink. Arthur Weasley had a little bit more, not enough to show that seven children and one badly paid job was a bad combination though. His children however showed even less. All in one degree or another showed increasingly less wise decisions. Harry James Potter thought stealing the most secure bank in the world was a good idea.
One day, Ginevra Weasley and Harry Potter had another misjudged idea: they decided to fall in love, get married and have children. Even worse, they chose to name their first born after two known brilliantly reckless individuals. The universe can only hold off the inevitable for so much and finally someone with absolutely no sense came into being. James Sirius Potter now graced Hogwarts with his presence, and in that moment he examined the school's motto carved into the Great Hall's floor.
"Draco Dormiens Nunquam Titillandus"
Anybody with some wisdom would know to follow that advice. As previously demonstrated, however, no such being was present in that moment. An opportunity was sighed. If one looked closely enough, as many wise people had before, a tiny, sleeping dragon could be seen draw on the bottom left of the insignia. Call it intuition or self-preserve instinct but nobody since the founders themselves ever tried to touch that part of the drawing. Until James walked alone in the Hall.
Headmistress McGonagall and her deputy were entering the Great Hall for an early breakfast when their blood froze. Alone, just above Hogwarts insignia stood their immediate bane. Both were experienced with what the members of that particular family could bring but nothing could have prepared them for that sight. It was too late to stop it now. They tried nonetheless.
Suddenly, where once stood a room that persevered through generations, wars and numerous aspiring pranksters there was only stones, plants and a clearly awake dragon. A little boy blinked his big brown eye innocently before being quickly summoned by the adults present.
Thus began James Sirius Potter Hogwarts career. Moreover, the tradition of eating in the common rooms.