There was the sketch from the "Blackadder Christmas special" some time ago.

Baldric (played by Tony Robinson as Bob Cratchitt) is toiling at his desk. Out of shot, Ebenezer Blackadder (Rowan Atkinson) can be heard approaching, saying loudly, "Humbug ! Humbug !".

He enters shot wreathed in smiles, proffers a bag of sweets, and says, "A humbug, Mr. Baldric ?"