The name of this has a great ring to it for a game.
What we mean by "fish" (ryby) in Czech is the paraphyletic superclass "osteichthyes" (bony fish). That's why we don't consider sharks as fish.
So the term fish isn't part of the scientific classification but it's a popular, demotic word which has a different meaning in each language. I find it quite interesting how the meaning of this word, which I thought was quite unambiguous, is so different in different cultures.
("Thinking" is probably an exaggeration.)
( not sure if I checked the box or not, it's 2am and gone back and forward to all kinds of pages if I am not carefull it will be morning and I will have read up all about insects, evolution, flight dynamics and whatever I will come across, which links in with the previous subject.. Kind of what some people have with youtube, I have with research, before you know it you will have spend hours, going from one subject to the next.)