Got stuck in that exact spot last year. I just ask how planes fly long routes if the earth is flat, because the flight paths make no sense on a flat map. My uncle is a pilot and he explained it once, and it stuck with me. It's a simple thing they have to actually explain. Miles992 has a good one with the time zones too, that's another solid basic point. Honestly, once someone says "CGI" you're done, they don't want real answers. Save your breath and go get another snack.