Old [adult swim] bump promoting their new series that, at the time of this airing, it was unknown that it was Xavier. They later aired another bump (https://www.bumpworthy.com/bumps/606) revealing the series.
Huge thanks to [bumpworthy]: https://www.bumpworthy.com/bumps/588

This bump's original air date is unknown, but from the "Coming November" text at the end it's safe to assume that it aired sometime in September/October of 2007, giving that Xavier's premiere happened on November 4, 2007