Really, nothing special about it. Just can't stop the craving, you know? I hardly ever get anything besides spicy tuna or spicy salmon rolls wherever I go; there's not much more of a selection where I'm from.
When I was in Japan, I got salmon, lettuce, and mayonnaise rolls at a local grocery store once. Maybe it was because I also got BBQ chicken wings during that same trip, but that was one of the best meals I bought from a grocery store.
(Also, they were huge! Four of these equals, like, ten of the sushi I bought in town.)
And here I thought posting about sushi would lessen the craving for sushi, whoops. Instead I'm wishing I could get more of those mayo/salmon/lettuce sushi.