Oh, Keith you rascal!

(AP Photo/Reed Saxon)

Olbermann dons O'Reilly mask at TV meeting

"We thought we'd help you out, those of you who needed a good photograph of," Olbermann said, pausing to hold up O'Reilly's photo glued to a stick as reporters laughed.

Olbermann has named O'Reilly his "Worst Person in the World" at least 15 times. The nightly "award" is Olbermann's way of criticizing bad behavior.

"It's just so much fun," Olbermann said. "I've always liked playing in traffic. I was told in 1977 that I had no future in the business and wouldn't last if I didn't change my style, so I don't really worry about it."