I make a point of being forthright when I don't understand something, or am not familiar with what someone's talking about, both at work and among friends. As f

I make a point of being forthright when I don't understand something, or am not familiar with what someone's talking about, both at work and among friends. As far as I know it has never hurt me, and I've often had people follow up with sentiments like, "oh thank god, I thought I was just dumb since everyone else seemed to get it". It's pretty damn uncommon for me to have been the only one in the room who didn't understand, and surprisingly often it turns out some of the others thought they understood, but a little digging prompted by my question or chain of questions reveals they in fact did not, so speaking up helps avoid problems later. It's worth noting that if you're the only one who spots some problem (or potential/opportunity) with an idea or plan or approach, that can feel a lot like being the only one who's not following ("why is everyone else nodding along? What am I not getting?"), but in fact it means you understand it better than anyone else present and really, really need to say something.