Direct link to this XKCD page: http://xkcd.com/337/
It also meshes well with Rule #21 of the USMC Rules of Gunfighting: ""Be polite. Be professional. But, have a plan to kill everyone you meet."
"A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects." -Lazarus Long