New York, 1984.

You were walking peacefully on the quietest streets of New York at night. You had just left a restaurant and just wanted to go home, but it starts to rain, and you slip and the key to your house falls into an open drain. You decide to go there, and there, from the shadows, you see a human-sized mutant creature.

...Dude, who are ya!?

Says Michelangelo, since you kept quiet.