you can tell Gunther over here is trying his damndest to look as tall as possible.... yeah im gonna stick with him being 5'1It isn't so much believing Ralph, I don't believe him - he isn't 5'10 for one second.
It's that looking at images of Ralph he doesn't look anything like someone who is 5'1 - not in his general stature, not when comparing him to others who we have a better understanding of height on. It's not just a case of eye-balling it either, I can't say for certain exactly how tall Ralph is - it's a rough estimation.
Back to more reasons why he's unlikely to be 5'1.
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You can tell he is putting pressure on other two which you can tell by how the coat looks.