"His brain was always thinking 10 steps ahead."

A choked-up Jimmy Fallon took to 'The Tonight Show' last night to pay tribute to the recently passed Robin Williams, a highly emotional affair that should help squeeze one last round of tears out of Williams' many shocked and saddened fans.

Williams, of course, hit the 'Tonight Show' many times during his career, and Fallon picked his tribute time to share a glimpse of his very first appearance on the show, back during the Johnny Carson years. Fallon's introductory Williams impersonation is great, but the real star of this tribute is the actual Williams footage, which perfectly highlights the actor's genius. Ready your tissues.

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