William Powell and Myrna Loy starred in (it says here) fourteen movies together between 1934 and 1947. They had an undeniable chemistry, and the DVD has a trailer that shows that the studio exploited that chemistry in its marketing.
This one is a screwball comedy from 1941, about the midpoint of their collaboration. Bill and Myrna play happily-married couple Steve and Susan, about to celebrate their fourth anniversary when things start going wrong, led off by an unexpected visit from Susan's meddlesome mother. Who is injured in a freak accident. Which sends Steve out of the apartment where he happens to meet an old flame. Who isn't adverse to a bit of extramarital relations, but they wind up in a stalled elevator (manned by—hey, that's Elisha Cook Jr.). Which… well, you get the idea.
After a series of misunderstandings and miscommunications, Susan decides she wants a divorce. Steve's only recourse is to fake insanity (which, given his basic screwball nature, isn't much of a stretch). Because (for some reason) you can't get divorced if your spouse is nuts.
It has a bit of a slapped-together vibe. Like the moviemakers were saying "OK, what should we do today? Hey, how about putting William Powell in drag?"
Everything's funny, though. For some reason, I liked actor/director Jack Carter's repeated line: "The name's Willoughby, Ward Willoughby." For some reason, it gets more amusing every time it's repeated.