After "OMG!?" and "WHEN!?!" and "WHAT?!?" ... the single most common question that we get when we tell people we're going to Japan is: Where? As in: "Wow that's so cool! So, like, where in Japan are you going to be?" Then we hold up our hand to represent the main "big" island of Japan and say "Imagine my hand represents the main island of Japan. We're going to Yamaguchi, which is here!" and point at the lower "southwest" corner.
I find this woefully inadequate, in part because the proportions of Japan are nothing like the proportions of my hand, and in part because my hand is not a series of tectonically active islands. Proportionally, Japan is actually more like a banana that has been left half devoured by hungry mice who were frightened away after attacking viciously on all sides... mostly I think this came to me because the picture below depicts Japan in yellow... and because in a previous apartment kitchen of mine, I actually woke up to discover a banana that had been partially devoured by mice, although at the time I didn't immediately think: Japan!
Japan - Mouse Banana (I really hope this isn't some sort of insult in Japanese)