Maybe it was Sweeps Week?

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from CNN.com:

Porn broadcast stuns news viewers

STOCKHOLM, Sweden (AP) -- Sweden's state broadcaster SVT on Monday faced ridicule for mistakenly showing a porn movie in the background of a news broadcast over the weekend.

Viewers of a 5-minute news update at midnight Saturday could see explicit scenes from a Czech porn movie on a TV screen behind news anchor Peter Dahlgren.

The monitor -- one of many on the wall of a control room visible behind the studio -- normally shows other news channels during broadcasts.

But staffers who earlier in the evening had watched a sports event on cable channel Canal Plus -- which often shows X-rated films after midnight -- had forgotten to switch it back, said news director Per Yng.

Imagine if that happened on The Situation Room... I think poor Wolf Blitzer would have a heart attack ;)