Yep. It's been remarked on - at least in other forums. I don't know if it was a concious decision on Johns part, (certainly it was on Martins part lol) but being a surrogate Sherlock, John adopted a particular characteristic.
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Beware of dragons for you are crunchy and go well with ketchup
Dr. Horribles sing along blog
You people all have to learn
This world is going to burn
Burn
(yeah, it’s two r’s. H, O, R, R, yeah right.)
Burn