My entire life was recently thrown into question when the Pottermore quiz revealed that I am Slytherin. For those of you who are not insane Harry Potter fans like me,let me translate this in plain English: I'm evil.
In the Harry Potter books, there are four houses at Hogwarts School of Witchcraft and Wizardry. Wizards are sorted into each house based on personality, or this information is gleaned from a magical Sorting Hat they wear.
Source: blastr.com