Or possibly worse - http://www.youtube.com⁄bad-site.com/something_else
opera:illegal-url-24
Error!
Invalid URL
The URL http://www.youtube.com⁄bad-site.com/something_else contains characters that are not valid in the location they are found.
The reason for their presence may be a mistyped URL, but the URL may also be an attempt to trick you into visiting a Web site which you might mistake for a site you trust.
When I hover over the link you gave (or click it and see it in the address bar), it looks like http://www.youtube.xn--combad-site-hx3f.com/something_else (which lets off plenty of flags for me).
Or possibly worse - http://www.youtube.com⁄bad-site.com/something_else