Protesters have managed to get into the Spanish parliament and video a mock theft of the PM's chair, seemingly after being let in by a security guard.
A security guard gave the protesters access to the parliament chamber
Video posted on the internet shows hooded figures apparently breaking into parliament and carrying off the chair the premier sits on during debates.
The group left a note for Jose Luis Rodriguez Zapatero, urging him to "stand up" against world poverty.
Officials said the chair had not been stolen, although it had been moved.
A statement issued by the parliament said that the guard who let them in was being disciplined.
Shouts of victory
Spain's Canal 24 Horas television reported that the official had requested permission for some relatives to record a home video of the parliamentary chamber.
The channel said the video spliced together images of the protesters inside parliament with shots of them scaling the walls of Madrid's Latin American cultural centre and breaking in through a window.
Mr Zapatero normally sits on the chair during debates
The protesters carry backpacks and are seen running through the deserted halls of parliament before throwing the chair out of a window amid shouts of victory.
The BBC's Danny Wood in Madrid says the group, named the 4Gatos ("four cats"), had released the video to draw attention to the UN's Millennium campaign to end world poverty by 2015.
"We did this because we want the president of Spain to do something about poverty and for the rest of the politicians to follow him, regardless of political affiliation," the statement said.