Yet another amusing story.

As best we can tell, this is a statue of king Tutankhamun and his lovely wife, who are credited with decorating this section of the hypostile hall. However, if you look at the cartouche on the statue, it's listed as someone else.

Pharaohs were notorious for 'tagging' the momuments and statues of previous Dynasties with their own name, in order to add to their personal glory -- and possibly keep enough likenesses of themselves around in case a majority of their own were destroyed. This is just another case.

So wouldn't it be kind of funny if the offending tagger, and not King Tut, was now missing his mouth in the Underworld? Heh heh...