One of my favorite Friends episodes maintained all three Aristotelian unities (time, place, action). It warmed the cockles of my heart (and almost made AP English worthwhile).

Which one? (Enough general plot for a Google search is all I'm looking for.) I've seen most of the series, but apparently that didn't stick in my mind.

Sure, it gets mocked, and generally sucks now,

And stoops to stealing plots from its own descendants. (Last season they recycled the main plot from "Coupling"'s "The Cupboard of Patrick's Love" with Chandler, Monica, and Richard (Tom Selleck).)