A couple of months ago, I watched a training session a defense attorney gave and his beginning premise was, don't say any word at all to anyone except your attorney. Then, he told why and when he got through, I wouldn't say anything if such happened to me. You can see the problem it caused with Zimmerman - they keep saying he changed his story five times (something like that) and if he hadn't said a word, they could not be saying that. If you change one word of what you said before, they will get you for that. Any positive statement you make will be used against you in a bad way.
Then, a prosecutor spoke and he said the attorney was right, say nothing, and then he told what prosecutors can and will do with any word you say.
Believe me, you say a word and it will come back to hit you in the head. Words you think will help you, won't, when the prosecutor uses those words.
You must be talking about the “don’t talk to cops” youtube video. I watch it every few months for entertainment. One of the most interesting parts was that he said sometimes the cops will “missremember” what you said and you are damned even though it is not what you said.
However, they can’t missremember what you didn’t say.
If something bad happened and you were involved - even if only a witness - you say absolutely nothing until you lawyer up.