Only if i assess the situation and it looks like immediate help is needed or something really bad could happen, or if (like others have said) someone is getting shitty or no help at all with regard to useful information. Otherwise, I mostly let people go about their business.
I will, however, make commentary about movies if I am next to someone having a talk about movies and are unsure what to see, if movie X was good or worth seeing, that sort of thing... but that's because that's what I know well, and can provide good (i believe) advice about.
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