XKCD is a self-described "webcomic of romance, sarcasm, math, and language." Created by Randall Munroe, a physicist and artist, this ever-growing series of comics has gained a strong following by taking a witty and comedic look at everything from logic to logarithmic scales. Check out a few of examples below and be sure to visit XKCD to see all the latest:

http://xkcd.com