I didn't see an atheist bus, but I did see these posters all over the place:
WAAAAAH IT HURTSES MY EYES. APOSTROPHISE DAMMIT!
(I actually can't look at it without wincing. I realise this is my problem, not theirs, and I should be concentrating on the lovely message. Whatever it is.)
(Also, the Firefox spellchecker doesn't underline "apostrophise". It does underline "Firefox" and "spellchecker", though.)
Edit: Just read a forum post that said, "He learn't his lesson". No, STOP apostrophising now! Wah.