Not seen that, but I do remember the Hush episode of Buffy which was either zero dialogue or mostly silent anyway. It's one of the best episodes they ever did.

What the... people are talking about Buffy and I wasn't consulted!?

There's a good bit of dialogue at the beginning of Hush. There's Riley/Buffy doing their thing, I think it's the first time Willow and Tara meet at that Wicca group, some other stuff too.

But after that no talking till the very end.

One of the best episodes, for sure.

Same here.  I loved Buffy.  Hey, why don't we have a OWC where we have to take an iconic show (like Buffy, or even crazy stuff like the Herculoids) and write an episode based on those characters?  It'd be fun.

No, it wouldn't. I hate shows like that with a passion.

No, it wouldn't. I hate shows like that with a passion.

I have suggested those two in the past. No one seems interested...

We did an unofficial no dialogue OWC back in -06, I believe. At least four of the participants have moved on to really big things since. One of them writes for Hollywood studios now. Two are multiple produced writers, including features and one writes for a big video game company.

Writing a script with no dialogue might be boring to read, but it teaches you to tell a story visually.  

I can see the questions now:

1. Does the rule only apply to humans - can animals talk?
2. What about Aliens?
3. Is sign language permissible?
4. What about unknown dialogues like Zulu?
5. Can characters speak in sounds?
6. Could I use music in place of dialogue?
7. Does dialogue coming from devices like radios and phones count?
8.

1. No.
2. No.
3. No.
4. No.
5. Sounds are allowed but only in the form of onomatapoeia. For example, if somebody stabs you in the kneecap with a fork, you'd likely yell out in pain.
6. No. No musical cues.
7. Yes, it counts as dialogue.

Easy peasy. Lol.

Dialogue

noun
1.
conversation between two or more persons.
2.
the conversation between characters in a novel, drama, etc.
3.
an exchange of ideas or opinions on a particular issue, especially a political or religious issue, with a view to reaching an amicable agreement or settlement.
4.
a literary work in the form of a conversation
5.
a musical composition for two or more parts suggestive of a conversation