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HANG TIME, Texas — Every time a bell rings an angel gets his wings.

In the NBA that familiar line from the holiday classic “It’s A Wonderful Life” has a different twist.

Every time the bell rings a head coach gets his walking papers and a handful of others start looking over their shoulders.

It’s a tenuous life.

Of course, this season has already been quite unusual with Mike Brown fired by the Lakers after just five games. But now that the schedule has reached the one-third mark and claimed Avery Johnson, it’s time to look at some others down around the bottom of the standings.

Randy Wittman, Wizards (3-23) – No, he hasn’t had John Wall all season. Yes, he’s had to play at times without Nene and Trevor Ariza and Bradley Beal. But the Wizards are the only group in Washington that makes Congress look competent by comparison. After a recent 100-68 thumping by the almost-as-hapless Pistons, even Wittman seemed to have enough. “That was an embarrassment, and I apologize to our ownership and to our fans,” he said. “I especially apologize to anyone who watched that entire game. I would have turned it off after the first five minutes.” It would seem to be a matter of when, not if.

Monty Williams, Hornets (6-22) – It’s hard to see the Hornets turning right around and cutting Williams loose just months after giving him a four-year contract extension. There has been the matter of Eric Gordon’s injury and the fact that No. 1 draft pick Anthony Davis was on the shelf for 13 games. But there are rumblings in New Orleans about his constantly changing rotations and collapse of his defense, which ranks 29th.

Byron Scott, Cavaliers (7-23) — The Cavs are likely headed to their third straight trip to the lottery under Scott, but that doesn’t mean that he’s headed to the exit. The key to his previous success at New Jersey and New Orleans was having a top-notch point guard and Scott has an excellent relationship with maybe the next great thing in Kyrie Irving. This was always a long, heavy lift from the moment LeBron James bolted and that has not changed.

Mike Dunlap, Bobcats (7-21) – What a difference a month makes. After beating the Wizards on Nov. 24, the Bobcats were 7-5, had matched their win total from last season and their rookie coach was getting praised. Now 16 straight losses later, Dunlap is preaching patience with his young core of Michael Kidd-Gilchrist, Kemba Walker, Byron Mullens and Jeffery Taylor. He has earned that. A dozen of Charlotte’s 21 losses have come by 10 points or less, a dramatic change from the historically horrible last season when the Bobcats were rolled in one-third of their games by 20 points or more.

Lawrence Frank, Pistons (9-22) — Frank insists that his Pistons are a better team than they were a year ago. The record — identical then and now — does not back that up. He says that his club now is more competitive, but just doesn’t know how to finish games. Some of the players have grumbled that there is also a failure of coach to make the right calls and adjustments when games get late. When push comes to shove, it’s the coach that gets nudged out the door.

Dwane Casey, Raptors (9-20)– Another one of those seasons when the Raptors were supposed to turn things around and make a push for the playoffs in the lesser Eastern Conference has gone south. Injuries to Andrea Bargnani, Kyle Lowry and Linas Kleiza. Amir Johnson gets suspended for throwing his mouthguard at a referee. G.M. Bryan Colangelo says the talent is there, but the Raptors lack focus and attention to detail. The Raps’ offense is mediocre (ranked 17th) and their defense just bad (27th). Even in Canada during the winter, that all puts Casey on thin ice.

Keith Smart, Kings (9-19) – Smart got the job to replace Paul Westphal specifically because of what was perceived as an ability to work with the mercurial DeMarcus Cousins. So he turned Cousins loose last season, let him do just about anything he pleased and got enough results to earn a contract extension. Now that Cousins has abused his free-rein relationship with his coach and another season is sinking fast, it would be easy to just blame Smart, which the Kings eventually will do. But this is a bad team with a knucklehead as its centerpiece and ownership that can’t tell you where they’ll be playing in two years.

Alvin Gentry, Suns (11-18) — It was at the end of a seven-game losing streak when Suns owner Robert Sarver told ESPN.com that Gentry’s job was safe. “We’ve got confidence in our coaching staff and we’re not considering making changes,” he said. Of course, that usually means start packing your bags. It was all about starting over in this first season post-Nash in the desert. He’s changed lineups more than his ties and the result is usually the same. Gentry is a good bet to last out the season, but it’s probably going to take a big finishing kick to return next year.