Say you want to post something like
You just have to do something like <a>Blah</a>

Not gonna happen, the comment page will still read it as HTML, it's impossible to post something like that without it being read as HTML, the <TT> tag reads HTML and the <CODE> tag is unavaliable.
Won't the pre tag ignore all HTML in it?

[edit] seems it won't, also, I am an idiot and accedently put the brackets on where I put pre... funny result [/edit]