|Date||Jan. 1st 2006|
|Next||Barrel - Part 5|
Donner is the 30th xkcd comic.
The Donner Party was a large group of American pioneers who got stranded in a mountain pass during the winter of 1846-47. After they ran out of food, they had to resort to cannibalism to survive. In the comic, they should be a party of four, but now there's only three of them; they presumably ate their fourth member, and are now full because of it.
"Some people haven't heard of the Donner Party. They were pioneers who got stranded and likely resorted to cannibalism."
This is just an explanation of the comic (see above), rather than a joke.