Rogue Bludger

The Rogue Bludger is a tampered Quidditch Bludger that mysteriously pursues only Harry Potter during a Gryffindor vs. Slytherin match in Harry Potter and the Chamber of Secrets, defying its usual random behavior. Revealed to be enchanted by Draco Malfoy's botched spell under the influence of Dobby the house-elf, it represents an early act of sabotage against Harry. Absent from subsequent books, it remains a singular incident highlighting the dangers of magical tampering in competitive sports.