Ordered the seafood in coach on the CLE->LGW flight last month. Turned out to be a thick filet of something (salmon) with rice & brocolli. It was not half bad.
On the flip flop I was also up for the seafood. The FA came around to hand distribute the meal specials prior to aisle carting the standard meals. She handed me my meal, which had the label "seafood" printed on the cover. I looked and it was a ham and cheese sandwich.
Suspecting a mistake, I popped into the galley to point out that I ordered the seafood, but this was ham. She looks at me like, yeah? I explained that I had requested seafood. She flat dead-eyes me. She then says she can take it back if I don't want it. Lesson for me: if they declare it seafood, it is seafood, what's the problem?