Without directly saying so, Comedy Central's Stephen Colbert all-but-confirmed last night that he was because his 91-year-old mother Lorna has been ill.
After dismissing some of the funnier, "wild rumors" about why The Colbert Report had suddenly gone dark (no, he didn't get an eye job), that "evidently, having 11 children makes you tough as nails ... confidential to a lovely lady" (at which point he did one of those point-at-your-nose gestures).
(Note: There are a couple slightly naughty words in Stephen's report; but nothing too "adult.")
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