Letterman-Leno promo was taped amid much secrecy:

02/8/2010 | Los Angeles Times (tiered subscription model)

Jay Leno took a secret trip to New York on the NBC jet last week and wore a hooded sweatshirt, sunglasses and a false mustache to sneak into CBS studios to film an unexpected promo for rival David Letterman's "Late Show" that featured the two late-night hosts watching the Super Bowl with Oprah Winfrey.

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