Kenan Thompson learned a "wealth of career knowledge" when Chris Farley guest-starred on All That

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"It was one of the greatest days I've ever seen," Thompson says of Farley's guest appearance as The Chicago Ketchup Chef on a 1997 episode of the Nickelodeon sketch series. "I learned literally a wealth of career knowledge in three hours, just watching a pro take direction. But also, do what he wanted. It was amazing."