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(USA TODAY) - It makes Jessica Simpson's Chicken of the Sea-or-tuna spectacle seem almost charming.

Bravo's Real Housewives have said a lot of really outrageous/terrifying/(insert adjective) things over the years, but the firm belief by Atlanta's 31-year-old Porsha Stewart that the Underground Railroad was a real railroad with a real train left even her co-stars grasping for words.

"Ding. Dong," NeNe Leakes said on Sunday's show.

"It's almost hurtful to watch her be so dumb," Kenya Moore said.

The epic gaffe occurred while the women were touring the First African Baptist Church in Savannah, Ga. The tour guide pointed to ventilation holes in the wood floor, below which lay a 4-foot-high crawl space, a small part of what every third grader learns: the Underground Railroad.

"There had to be an opening for the railroad at some point," reasons Stewart, whose ex is former NFLer Kordell Stewart. "Somebody's driving the train. It's not electric like we have now."

The women pounce. "It wasn't a train," Phaedra Parks explained. "It was a euphemism, baby. A figure of speech."

Then they proceed to give her the history lesson we can only hope she simply slept through.

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