Albus Dumbledore knew what he had to do. He needed to go back in time and save the world. It seemed like a fairly easy task.
"Well, here we go," said the Headmaster and a bright flash of light surrounded him, and with a loud 'pop', he disappeared.
Tom Riddle entered the office. He sat on a chair and looked into the eyes of his nemesis, Albus Dumbledore.
"Hello, Tom. What can I do for you?" asked the Headmaster, smiling politely at his old student.
"You know what I want. I want to be a teacher here. Let me teach Defence Against The Dark Arts, you know that I'm the best for this job."
"Hmm... okay, I don't see why not."
"Thank you. I will give it my best," Tom said and left the office.
"Well, mission complete. And now, to more important matters - where are my lemon drops?"