Kelsey Grammer reveals the inspiration behind Sideshow Bob

Ever wondered where Sideshow Bob's iconic voice comes from?

Well, Kelsey Grammer — who voices The Simpsons' bushy-haired maniac — is here to tell you.

SEE ALSO: Every way Sideshow Bob killed Bart in this year's 'Simpsons' Halloween special

Grammer appeared on The Graham Norton Show on Friday, where he explained how he first became involved in The Simpsons before going on to reveal the real-life person who inspired the Sideshow Bob voice.

Skip to 1:45 for an on-point Sideshow Bob impression.

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