I've just now noticed that "Yeah, I'll have a..." is my go-to, which is a little weird to me bc I've never been like "Nah, lemme think about it more" and like.. then I wouldn't even be in line yet if that was the case. Like I never misheard what they said either, so the "yeah" is kinda unnecessary. In terms of a "would you like to order?" / "yeah, I hear you. I''ll have a .." then.. I guess I get it, but maybe I'm overthinking it lol can you tell I have anxiety ordering food by now? xD