The 'Uranus' answer is as old as the hills and always gets a 'groan' but as was said most people are looking for an opening comment because they really don't understand the physics and scales astronomy works on. I always try to give understandable answers and in most cases get some sort of ''Oh!" back which means I have enlightened them slightly.
I got a bit of a reputation when the eclipse and Transit happened last year so colleagues tolerate my idiocyncracies and progressively improving astro pix on the office wall. Also a pic of the big scope up there tends to make them go 'wow' especially when you tell them you built it largely from chucked out aluminium tube and plywood from work...
But you still get some weird questions ....
