Hogwarts: My name is the Unforgivable Curse...

"Hello, unfamiliar wizard, what's your name?"
"Avada Kedavra".
"Holy crap! What are you doing?!"
"...My name is Avada Kedavra, Avada Kedavra."
"...Who gave you this lousy name?"
"I heard it's the Department of Mysteries."
"Do you have a grudge against the Ministry of Magic?"
"No, they wouldn't dare."
"...Then how should I address you? I can't exactly chant a killing curse as soon as we meet, can I?"
"You can call me: the pioneer of the magical world's technological explosion, the forerunner of Muggle exploration of magic, the ruler of Hufflepuff's Kitchen, the Ducklord, the Younofull..."