Downton Abbey Cast Performs Scene With American Accents on Late Show — And It's Unsettling (Watch Video)

If any American broadcaster is contemplating a Stateside adaptation of Downton Abbey, you just stop that. Stop that right now.

On Wednesday’s Late Show, Stephen Colbert put the period piece to the ultimate test by inviting Michelle Dockery, Hugh Bonneville and Allen Leech to perform a scene without their plummy native accents.

Needless to say, no one needs to hear from valley girl Mary or fashionista Tom ever again.

Watch the disturbing scene play out above, then attempt to forget all about it before Downton returns for its farewell season Sunday, Jan. 3.