xkcd's latest comic is t-shirt material. (As always, mouse over the comic for the hidden comment. Works on some of mine as well!)
What really prompts me to post, though is the stupidity of so many responses on the livejournal feed.
They so completely do not understand this aspect of what xkcd is about (skepticism and science), it makes me wonder why they read the feed at all.
edit: Damn. I should have realized Pharyngula would point to this one. I don't mind being so unoriginal as to just point to a webcomic, but I do mind being so unoriginal as to point to one already being pointed to by a hugely more popular blog. (And Shalini at Scientia Natura has followed suit. Now I feel like a sheeple. Retrospectively. Wait, I mean "great minds think alike". Yeah, that's the ticket.)