Knowing full well that the Sunday night TV's main attraction was 'Lost,' 'The Simpsons' opened its show with a fake spoiler of the much-ballyhooed finale. On the chalkboard, Bart had written:
"End Of 'Lost': It Was All The Dog's Dream. Watch Us."
Bart's chalkboard has become the frequent home for hidden, topical jokes. In a recent episode, 'Simpsons' writers used it to show solidarity for South Park creators Trey Parker and Matt Stone. (via The Daily What)