When the request is too vague

I blank so hard at these kind of questions. Then I panic about how blank I must look so then I extra can’t “make up what a normie might say” the damn vicious circle. I read something this was called hmmm…. Had to google it, selective mutism. Was quite interesting to think back through times this happened to me, but interestingly am only now realizing how much it was in response to vague open ended prompts