I was walking.
I was walking when I saw something.
I was walking and that something was me.
I was walking and noticed another me.
I was walking and noticed there was more of me.
I was walking and there was even more of me.
I was walking and noticed that me was copying me.
I was walking and saw that all those me's copied everything I did.
I was walking and noticed that they couldn't talk.
I was walking and noticed something else.
I was walking in a room filled with mirrors.