The political performance artists known as the Yes Men infiltrated the U.S. Chamber of Commerce building in Washington, D.C., Tuesday and made it to the fourth floor before being ejected.

"We tried to get in and have a talk with their people," said Yes Men agitator Mike Bonanno. "They didn't want to let us in, but they did, accidentally. There were five of us."

Several members of the group managed to slip by guards as others were challenged at the front door. They then went inside and changed into inflatable "SurvivaBall" suits and began wandering the halls.

"They didn't have much of a sense of humor about it," said Bonanno. "They described it as a building invasion."

Chamber officials called the police, but the Yes Men took their cue and left. "We didn't wait around for the cops," Bonanno said.

The prank comes one day after the Yes Men fooled much of official Washington, and, um, a few media outlets, including, yes, National Journal, with a bogus news release and press conference at the National Press Club. There they announced the chamber had renounced its opposition to the cap-and-trade energy bill working its way through Congress.