Pansy Parkinson kicked Neville Longbottom in the nuts.
When sent to the Headmaster's office to explain herself, she claimed it was because she had cast a curse on him that meant Neville would be safe from fatal harm so long as he received a savage smack to the family jewels from her at least once a day.
The truth of this matter could not be established one way or another, so after agreeing to receive a House point deduction for Slytherin every time she did so, Pansy was allowed to continue. Neville always sees her coming, but he has resolved to accept this as a stalwart Gryffindor. He also likes to tell fellow students that Pansy just can't get enough of touching his 'golden snitches'.
"Same time tomorrow, Longbottom?"
"Looking forward to it, Pansy!" he gasped with a triumphant grin while curled up on the floor in agony.
Many girls at Hogwarts now consider him to be one of the most eminently desirable boys in the whole student body.
Author's Note: This fic is dedicated to Sacred Dust, whose story 'Perennial' was what gave me the inspiration to write it. Feel free to check out this work and others by the author!