Well this can go different ways.
You don't specify the gender, apperence, or intent of the stranger.
So I can't really answer the question.
English
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Well you don't know gender, appearance or intention of that person, so if you can't come up with something in the time it took you to read, think, then respond, you're [i]f[/i]ucked.
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I could probably tell their gender, and probably appearance, but either way I would flash them one of my rarest Pepes to show them my superiority and my dank memester status. Then, as they are stunned by my obvious greatness, I would escape through the window and disappear into the night. If, however, I were to discover this stranger to be Gabe, I would preform the above actions in reverse order.