870
xkcd #2897: Light Leap Years
(imgs.xkcd.com)
Alt text:
When Pope Gregory XIII briefly shortened the light-year in 1582, it led to navigational chaos and the loss of several Papal starships.
Just wondering, but do people actually find xkcd funny? Are these comics supposed to be funny?
This one made me laugh. Most I just find to be novel, silly, or interesting, but a fair few are pretty funny to me.