I love XKCD, the web comic. It can be very geeky with jokes about math, physics, and computers. Not everyone will understand this one.
I got it right away due to my experience with linx computers. In this one the cartoonist goes with history.
I was familiar enough with the the reference to get the joke. English longbows were used to defeat a larger force of french knights. I then went to wikipedia to read the details. The battle was part of the Hundred Year War, and the famous speech in Shakespeare's Henry V is based on this battle.