An online comic strip catered towards geeks/math majors/etc. Makes the fatal flaw of assuming that because it has a niche audience, it will automatically be funny. On the contrary, it is rarely amusing, and is only popular due to said audience's lack of recognition in most mediums.
"The vector of c is 5."
"Hahah! I think that that comci, xkcd, is funny because I automatically approve of anything nerdy. I also love the dick."