Mine is... Well I actually don't know what it was.
Years ago I was in Japan, and I was on a bit of a drinking binge with this guy who learned English from wanting to understand the lyrics of Led Zepplin songs. So we went to this sushi place, and I had never tried sushi, so the guy got me a bunch of stuff. I asked him what it was, to which he just said,
"Try it, it's good."
After eating it, I told him it all tasted amazing, so he ordered something else. That tasted great too, so he ordered something else... This continued for a few hours while we got progressively drunker.
Eventually the guy got talking to the chef and explained I'd never tried sushi before this evening, and a fire lit in the chef's eyes. He grabbed his knives and did some highly theatrical preparation before putting something in front of me. I asked what it was, but just got the same answer.
"Try it, it's good."
So I did. And it tasted incredible. However, I don't remember what it tasted like or even what it was, because we had been drinking for about 5 hours at this point and while my tolerance is pretty good, this guy must've been a professional drinker.
About a year later I happened to be in that neck of the woods again and that sushi place was closed - it had actually been demolished leaving an empty lot, and I jokingly imagine that it was never there in the first place and maybe I hallucinated the whole thing. So I guess I'll never know what the phantom amazing sushi was.