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Last night, Mayor Michael Bloomberg paid a visit to the talk show host, who's about to move to Burbank to take over the "Tonight Show."

O'Brien's nightly television time will move up an hour when he replaces Jay Leno on the "Tonight Show."

On last night's program, the mayor offered O'Brien a keepsake for his 16 seasons in the city.

"I'm floored. I'm stunned. I'm receiving a key to New York City," said O'Brien.

"No, sorry, it's not a key to New York," countered Bloomberg. "It's the key to the Port Authority bus terminal's men's room. Hasta la Vista, baby."

O'Brien's final New York show will air tomorrow night.