This is a well-known web comic with stick figures. It is also a very good indicator of your geekiness. If you understand and like some of the jokes (and you need to have a university-level math and physics classes under your belt for this), you are a geek. If you understand all of the jokes, you are a super-geek. Finally, if you are able to find an xkcd comic which is related to any particular life situation, you are an uber-geek; I kid you not, I saw people doing it.
My point is the following: my university degree was not enough to understand every comic, so proceed with caution. Still, some of the comics are funny and fairly easy to understand which warrants 3-star rating.