While it’s not generally possible in a business context to do too many nasty things to cold call sales people, the same rules do not apply when one is out of the office. Fortunately, in Britain, there is a Telephone Preference Service which is supposed to act as a barrier to unwanted marketing calls; this is by and large successful, but still, some ignore the rules.

Vengance is justified; the most skilled crusader against the scourge of unwanted telephone calls is the comedian Tom Mabe. Here follows one of his bouts of verbal jujitsu with a telemarketer, which hopefully will encourage the individual to change his career: