I remember Bill Nye doing this in one episode. He had the earth as a golf ball, I think? He was running around a soccer field showing the planets. And he drove miles away to show where Pluto would be.

Edit: this episode! https://www.youtube.com/watch?v=gRIVwGwdxI8#t=250

Edit2: nope, this one (guess he liked this trick lol) https://www.youtube.com/watch?v=A_OWnlS56rE#t=325 Pluto is only 100 meters away, but Alpha Centauri is 700 km away!