a very easy graphical glitch
 

ok so Im sure Jagex knows about it by now, but either way:

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[hide=1] Just wear a zombie mask and talk to an NPC and you head will appear at about 50% of its normal size. I tryed this when HD first went public so it may have been fixed, but my account with a zombie mask is banned so I cant confirm =\[/hide]

LOL it works if your a girl

nice find:)