If you read all the http://www.explainxkcd.com/wiki/index.php/Category:Comics_featuring_Beret_Guy http://www.explainxkcd.com/wiki/index.php/Category:Comics_fe..

If you read all the http://www.explainxkcd.com/wiki/index.php/Category:Comics_featuring_Beret_Guy http://www.explainxkcd.com/wiki/index.php/Category:Comics_fe... , many/most of them follow similar themes to this. It's more of a continuation of a character than a self-contained joke.