I realize your post is partially tongue-in-cheek, but quick FYI: It's not so much a "rule" as a matter of practicality. If you ask any of the movie armorers on here (there are several of them who are IMFDB members), they'll tell you that the Beretta 92F is common in movies because it has a reputation for being extremely reliable with blank ammunition.

Out of curiosity, have you ever handled/fired a Beretta, or are you just echoing Smithy? I still think he's full of crap, and I personally used to own one of those "craptacular" pistols.

They're good enough for the Los Angeles Police Department AND the Los Angeles County Sheriff's Department.

The beretta is an ergonomic nightmare for me.

It's not my absolute favorite, but I like the Beretta despite some design flaws.I especially like those big,very visible sights.

Not to mention the United States Army and Marine Corps.

-However the LAPD has actually switched to the Glock 22

The LAPD approves several guns, Beretta 92 series guns being some of them.

More importantly though, ergonomics relative to other designs that aren't necessarily "bad," or a few isolated cases of failure which may be the result of poor maintenance, ammunition or magazines rather than the gun design itself, does not mean the gun suffers from "design flaw" at least not by those reasons. Is a SIG decocker better than the slide mounted setup on the Beretta? Perhaps. Does it make the Beretta's decocking system crap? No. It's arguably not as good, but that doesn't mean it's bad. Frankly I've got no problem decocking my Beretta with one hand, though I'll concede the SIG system is better. Appropriate grip size is also relative, so if you don't like it, that's fine, but again, that doesn't mean the gun is ergonomically poor, it just means other guns are ergonomically superior.

As far as reliability goes, EVERYTHING has the potential to fail, regardless of design. I've seen Berettas fail, I've seen 1911s fail, I've seen AKs fail. It doesn't mean the design is poor (if there are only a few cases that is), but there's something wrong with that particular device or another variable, and most assuredly, for that gun, there are thousands upon thousands more that work just fine.

Berettas are not craptacular pistols, they are good guns with a legacy, and are worthy of our respect, even if their usability is slightly overshadowed by other technology out there. Look at the magazine as half full and not half empty, and don't call something "bad" because something else is more "good". One can be "good" and the other "better" but in that case, the former is not even close to "bad".

A. Beretta grip is large and unconfortable.
B. Slide mounted safety can accidentally turn on when racking slide (yeah, some of us do that over using slide release.)
C. Bigger than a 9mm should be.

A. That is circumstatial to you, and possibly others, but doesn't reflect the gun as a whole, with everyone, and certainly not a majority of people.
B. Same as A2, but I'll add that I slingshot as well and I have never activated a slide mounted safety in practice or even come close to doing so on my Beretta or my S&W 5906.
C. It is in fact bigger than most other 9mms, but that is based in relativity and isn't necessarily a flaw, and most certainly not a flaw in the design.

I've handled a Beretta and I've never accidentally flicked the slide when racking it. Unless the safety switch has been worn out from overuse, I don't see you accidentally flicking it. Maybe if you are in combat and you decided to rack the slide instead of pressing the convenient safety release. And flicking the safety on and off should come second nature to someone that's had enough practice with the gun.

Of that I've no doubt. You're right; my post was meant to be quite tongue-in-cheek. I wasn't trying to bash the 92. I've never fired one, but I know their ubiquity has a reason. Still, it would be nice to not have every film featuring firearms constantly use 92s, Glocks, or Sigs. They're all fine weapons (though I dislike the latter), but I'd personally like to see a main character use something like a Steyr M1A or some other firearm that never gets the spotlight.