Randall Munroe has outdone himself this time

My favourite part is the blood spatter that just happens to be covering the spot in the comic's text where a serial comma isn't, and this becomes important four lines later.

When I went to Wikipedia to get that reference for "serial comma", I half-expected to see a trivia item about xkcd's mention of it today, because xkcd is more notable than are serial commas.  But no, and I didn't feel like adding it.
(What?  You wanted more "Mass. Trip of Doom" posts?)