/xkcd – Show a xkcd comic. Subcommands: latest, random, relevant or any number.
/currency – Convert a currency. Subcommands: convert
/dice – Roll a dice. Can be a specific dice such as 2d20.
/youtube – Returns the first youtube search result.
/meme – Generates a meme taken from the provided text.
/porn – Shows porn images, videos or pornstar page.
/changelog– See whats new.

Also:
Try any of these commands with the ‘help’ subcommand to see what it can do.

For example: ‘@JamesTheBot xkcd help’