No sooner did BP CEO Tony Hayward begin the first sentence of his opening statement at a House hearing Thursday morning than a protester disrupted the hearing.

A woman with a black oil-like substance on her hands and face stood up and started shouting down Hayward before he could get a word in.

"You should be in prison!" she yelled at the BP chief.

Security guards struggled to quiet the woman down, and eventually removed her from the hearing room.

"Emotions run high on this issue, but we have a hearing to conduct here," said Rep. Bart Stupak (D-Mich.), who heads the Oversight and Investigations Subcommittee that is holding the hearing.