Watching Jimmy Fallon strut his stuff onstage is two cans of Red Bull and a caffeine pill chaser for the psyche. He is a blur of boundless energy, elastic voiced, a troubadour satirist with a guitar.

Exhibit A: During one bit Saturday night at The Improv in Schaumburg, he did 16 spot-on celebrity impressions in 160 seconds.

Yes, he may be playing Woodfield Mall tonight (the Branson, Mo., of the northwest suburbs), but Fallon, he of charming boyish aloofness, of meticulously kempt-unkempt hair, is a prince in waiting.

In March, the "Saturday Night Live" alumnus inherits NBC's vice presidency of late-night television. As "The Tonight Show" swears in President Conan O'Brien, Fallon will take over "Late Night's" 11:35 p.m. slot.

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