xkcd

Just mention the bot and tell it which xkcd you want! E.g:

• @xkcd help shows some help about using it,
• @xkcd 386 displays comic #386,
• @xkcd latest gives you the latest comic,
• @xkcd random gives you a random comic,
• @xkcd bobby tables searches for a comic that matches these keywords,
• @xkcd video games -ferret searches for a comic that talks about video games, but not the one with the ferret.
• @xkcd /reg.*ex/ performs a search by regular expression.

Alternatively, you can trigger it by using the xkcd! prefix (xkcd!386, xkcd!latest, xkcd!random, etc.).

If you're concerned about flooding channels with images and are just looking for fun, you can DM the bot and ask it directly what you want. No prefix or mention required.