Hey, so I found this snippet and thought it might work nicely instead of the Random SCP page. I whipped up a little display for you here. I did it on the sandbox a bit, go to this page right here and it throws you at a random sandbox page. This one throws you at random sandbox pages tagged as "scp" (why do we even have these on the sandbox?).
First, make two pages, titled "nav:random" and "nav:random-redirect".
Note: This should be the only text on the page. As far as I know, once you click Save, you won't be able to go back and edit the page. So be careful to copy-paste it correctly the first time!
On the page titled "nav:random"
[[html]]
html
body
<script type="text/javascript">
window.parent.location.replace("http://www.scp-wiki.net/nav:random-redirect/limit/" + Math.round(Math.random() * 25));
</script>
/body
/html
[[/html]]
[[image http://dl.dropbox.com/u/3923260/scptest.jpg]]
On the page titled "nav:random-redirect"
[[image http://dl.dropbox.com/u/3923260/scptest.jpg]]
[[module ListPages category="_default" order="random" limit="@URL|1" reverse="yes" tags="+scp"]]
[[iframe http://snippets.wdfiles.com/local--code/code:iframe-redirect#%%link%% frameborder="0" width="1" height="1"]]
[[/module]]