House of Commons of the United Kingdom canister of chlorobenzylidene malonitrile (tear gas). Even members have been known to disturb proceedings of the House. For instance, in 1976, Conservative MP Michael Heseltine seized and brandished the Mace of the House during a heated debate. However, perhaps the most famous disruption of the House of Commons was caused by Charles I, who entered the Commons Chamber in 1642 with an armed force to arrest five members for high treason. This action was deemed a breach of the privilege of the House, and has given rise to the tradition that the monarch does not set foot in the House
House of Commons of the United Kingdom House may also sit at weekends. Sittings of the House are open to the public, but the House may at any time vote to sit in private, which has occurred only twice since 1950. Traditionally, a Member who desired that the House sit privately could shout "I spy strangers" and a vote would automatically follow. In the past, when relations between the Commons and the Crown were less than cordial, this procedure was used whenever the House wanted to keep its debate private. More often, however, this device was used to delay and disrupt proceedings; as a result, it was