At a C-SPAN-televised committee hearing Wednesday in which Issa (R-Calif.) tried to squeeze IRS bureaucrat Lois Lerner for answers on the IRS scandal in which the agency supposedly targeted tea partier nonprofits for audits. Issa turned the mic over to Cummings (D-Md.) for questions. Cummings said he had a question, but first launched into an attack on what he said was Issa's politically motivated witch hunt.

So Issa cut off his mic. And, as the video above shows, it hits the fan.