Across the street from you is an odd looking figure; scars all over his body, a little chub; he seems like the type of guy to hide his face. You stare at him long enough that he catches you doing it. In an instant he seems to disappear, but a voice behind you markedly says otherwise.

"Now, what's all that staring for?"

You turn around and, yeah, it's the guy. How did he teleport behind you??