Cadillac Man (1990), starring Robin Williams and Tim Robbins, among others.
It’s about a car salesman who will literally try and sell anybody, anywhere (at one point he pitches people at a funeral procession) and who is not only good at his job, loves it, and loves the many women still in his life.
And he and a few other sales guys are about to be canned unless they can unload a whole lotta cadillacs.
Their day goes from bad to worse when an unemployed mechanic (Robbins) married to their receptionist crashes into their sales floor and takes everyone hostage, determined to find out at gunpoint which one of those guys is banging his wife.
Cops are called, guns are waved, hilarity ensues. Williams finds himself negotiating between the cops and Robbins and the scared hostages, thinking fast on his feet as his ex-wife and ALL his girlfriends show up for the drama.

I love this film, and it’s even more of a treat now that I actually know what New York is like (it’s very New York) and it breaks some rules (Robbins doesn’t crash into the building until about a half hour into the movie) and didn’t do as well as hoped when originally released, but it’s a classic cool movie that I highly recommend.
So watch you some Cadillac Man today.