I wouldn't claim to 'know' a programming language, wouldn't it require me to know all the tags and stuff that could possibly be used in it?
Anyways, I understand:
HTML
XML
... Uhh...
Lol at LOLCODE!!!
KTHXBYE
I know a LOT of the tags in HTML, and when I say KNOW, that means either you know all of the tags of the code, or you understand it.
HAI
CAN HAS STDIO?
VISIBLE "HAI WORLD!"
KTHXBYE