Whack-O! was a British sitcom TV series starring Jimmy Edwards, written by Frank Muir and Denis Norden, and broadcast from 1956 to 1960 and 1971 to 1972. The series (in black and white) ran on the BBC from 1956 to 1960 and (in colour) from 1971 to 1972. Edwards took the part of Professor James Edwards, M.A., the drunken, gambling, devious, cane-swishing headmaster who tyrannised staff and children at Chiselbury public school (described in the opening titles as "for the sons of Gentlefolk").