Do you think you could win a fight against someone the same size as you?

I'm intrigued as to how people think of their ability in a fight lol

Let's say the person your fighting is roughly the same height and build, though isn't like a black belt in karate or anything. Just an average person plucked off the street

Do you think you could take them? :P
Do you think you could win a fight against someone the same size as you?
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