"In a sit-in, protesters usually seat themselves and remain seated until they are evicted, usually by force, or until their requests have been met. Sit-ins have been a highly successful form of protest because they cause disruption that draws attention to the protest and by proxy the protesters' cause. The forced removal of protesters and sometimes the answer of non-violence with violence often arouses sympathy from the public, increasing the chances of the demonstrators reaching their goal. Sit-ins usually occur indoors at businesses or government offices" (wikipedia.org).

Or bathrooms.