Go on youtube. Choose any video. Add the following script:
[php]<script>IF_HTML_FUNCTION?<h1><marquee><font color="red"><u>add your comment here<script>[/php]
Update (1): It is better to stay away from YouTube until they fix the vulnerability or at least logging out of YouTube if you use it.
Update (2): Google has informed that the vulnerability has now been fixed:
We took swift action to fix a cross-site scripting (XSS) vulnerability on youtube.com that was discovered several hours ago. Comments were temporarily hidden by default within an hour, and we released a complete fix for the issue in about two hours. We’re continuing to study the vulnerability to help prevent similar issues in the future.
you can find the statement here.
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