Before the second season had even ended, AMC started promoting pre-orders for the Blu-ray box set of the same season on their website. Which is great and all, but take a closer look at the extras detailed in the description:
"And don't forget to Wikipedia 'Michonne'!"
Wait a minute, "Shane's last episode"?! That's right: With three episodes still to go before the end of the season, someone at AMC carelessly spoiled the fact that Shane wouldn't make it to the next one.
Now, it's true that Shane also died in the comic series the show is based on, but they'd already deviated from the story by making him survive way longer than he did there, so as far as fans knew, he could have stayed alive for the entire duration of the show. Obviously, the auto-spoiler was followed by fan outcry, and AMC even released a statement claiming that the ad was unauthorized and that "the matter is currently under investigation."