 Some are effectively dart-firing blowpipes, which are far easier to disguise being little more than a hollow tube.The weapon was used during a bank hold-up as part of the pizza bomber case.Cane guns have an abiding place in spy culture; a famous example appeared in Ian Fleming's 1953 novel, "Casino Royale", in which James Bond is threatened with one during his contest at the gaming table with "Le Chiffre."