The X-Files did an epi with the Brady Bunch house...
Although the last two or three seasons of the X-Files saw perhaps an overall decline in the quality of the show, they also produced some gems of singular episodes and that was one of them. The episode with the Brady House was titled "Sunshine Days," and it was the very last episode before the two-part series finale.
It was also the same thing I thought of when I saw the title of the thread ;-)
Oops...meant to add that that episode also featured a cameo by David Faustino of “Married with Children,” as a quirky juxtaposition to the whole Brady theme, and was written and directed by Vince Gilligan, later creator of, “Breaking Bad.”