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Jay Leno at 'The Tonight Show with Jay Leno' at the NBC Studios in Burbank, Ca. Thursday, Sept. 12, 2002.
Jay Leno at 'The Tonight Show with Jay Leno' at the NBC Studios in Burbank, Ca. Thursday, Sept. 12, 2002.

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    Jay Leno makes surprise appearance on 'Tonight Show'

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Jay Leno makes surprise appearance on 'Tonight Show'

The monologue must go on, so when Jimmy Fallon "pulled a hammy," Jay Leno briefly took back "The Tonight Show" reign.

Jay Leno makes surprise appearance on 'Tonight Show'

The monologue must go on, so when Jimmy Fallon "pulled a hammy," Jay Leno briefly took back "The Tonight Show" reign.