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On [[Xenu]], there is an image thumbnail with this syntax: 
[[Image:Puu oo.jpg|thumb|250px|right|Xenu is said to have dumped his surplus 
population around volcanoes like this one on [[Hawaii]] and blown them up with 
[[Nuclear weapon#Fusion bombs|hydrogen bomb]]s.]] 
However, mediawiki renders HTML as: 
<a href="/wiki/Image:Puu_oo.jpg" class="internal" title="Xenu is said to have dumped 
his surplus population around volcanoes like this one on  and blown them up 
with ."><img 
src="http://upload.wikimedia.org/wikipedia/en/thumb/4/43/250px-Puu_oo.jpg" alt="Xenu 
is said to have dumped his surplus population around volcanoes like this one on  and 
blown them up with ." width="250" height="166" 
longdesc="/wiki/Image:Puu_oo.jpg" /></a> 
dropping the words "Hawaii" and "hydrogen bombs".