I took the sentient space craft joke to be a reference to the movie "Dark Star".
Harpoon is a brand of rum. Did a bottle make it into space? 220.127.116.11 12:55, 1 August 2014 (UTC)
Did this comic upload quite late in the day for anyone else? Is anyone else experiencing or did anyone else experience that "Latest Comic" is still going to 1401 as ix XKCD.com and XKCD.com/#
"This is obviously a joke, as sentient spacecraft cannot be created with current technology." Yeah, will need a citation on that... 18.104.22.168 13:23, 1 August 2014 (UTC)
Definitely a joke. Appolo 12’s call sign was Yankee Clipper, and a clipper ship would not carry any harpoons.22.214.171.124 14:04, 1 August 2014 (UTC)