Some thoughts about Sushi

I recently took a trip to Oakland, CA and was reminded of just how global sushi has become. While stopping in at a gas station (in a not-so-nice neighborhood), I noticed a cooler full of sushi rolls and nigiri. My friend excitedly started grabbing up spam nigiri. Spam Nigiri! I had only seen such things in Hawaii and thought them ridiculous. Sushi has become so embedded in our culture that we have Americanized (or bastardized) it. I wonder if this has been done in other parts of the world to which the sushi phenomena has spread.