What's that metaphor

[Dynamite Kid]

What's that metaphor where by it means, if one guy is being loud, acting silly, and you make keep quiet, other people will know who the idiot it is?

[BigStereotype]

I think you mean idiom, but the closest I can think of is "never argue with fools because from a distance, you cannot tell who is who" or some **** like that. Also "better to have people believe you are ****** than to open your mouth and remove all doubt." I think Mark Twain said that. I don't know about the first one.

[Amazinger]

I think it's the idiom."An empty vessel makes the loudest noise".
Or "An empty can rattles the most".......

[Dynamite Kid]

I think you mean idiom, but the closest I can think of is "never argue with fools because from a distance, you cannot tell who is who" or some **** like that. Also "better to have people believe you are ****** than to open your mouth and remove all doubt." I think Mark Twain said that. I don't know about the first one.

Yeah its something of that nature. Do you know what it is word 4 word?

[GOAT86]

I bet TS got some severe overdose of those feggahs here......

[Pez]

This is probably not what you're looking for but it's similar and one of my favorites:

"Light travels faster than sound. That's why some people appear to be bright before you hear them speak."