The actress appears on the latest episode, almost two years to the day after Kutcher gobbled chicken wings doused in various hot sauces as he took on the show's challenge while answering questions about his life and career.
And when Mila was reminded of what he said about clearing out his trademark trucker hats and TV show wardrobe from their house, she turned on Ashton, who was standing off-camera.
"What are you talking about?" she screamed at her husband. "You have plenty of trucker hats and the entire That 70s Show wardrobe is downstairs... Lies."
Ashton could be heard off-camera, yelling, "Who are you talking to?"
Mila also revealed her man was "downplaying" a story he told on the show about suffering pancreatitis due to the all-fruit diet he adopted before portraying tech boffin Steve Jobs in a biopic.
"He was so dumb," she laughed. "He also only ate grapes at one point. It was so stupid. We ended up in the hospital twice with pancreatitis."
Mila also told host Sean Evans about the compromises she has made as the short wife of a Hollywood giant, adding, "I'm five foot four on a good day (and) my husband's six foot three; our house is built for six foot three. I'm at all times on tippy toes... I have ladders everywhere... I can't reach things."