Here are some examples:
Movies:
* Event Horizon (1997): He played the role of "Doctor Weir" in this science fiction horror film which he also directed.
* Alien vs. Predator (2004): He appeared in a cameo role as "Dr. Charles Bishop Weyland", the CEO of Weyland-Yutani. This was another movie he directed.
* Resident Evil: Afterlife (2010): He made a cameo appearance as a mysterious figure in this film, which he also directed.
Television:
* The Tomorrow People (2013-2014): Anderson directed several episodes of this sci-fi drama series. While he didn't appear in the show, he did make a small cameo in one episode as a "Police Officer".
However, it's important to note that these are just a few examples. There may be other, smaller projects or cameos that haven't been widely reported.
Paul W.S. Anderson is primarily known for his work as a director, screenwriter, and producer, rather than an actor.