Answer: What is this called and why do they do that?

When you see something out of the ordinary... Two fish swimming in close formation ...the interested SearchResearcher should say "What??" Or at least, "How's that?" As Isaac Asimov is alleged to have said, The most exciting phrase to hear in science, the one that heralds the most discoveries, is not “Eureka!” but 'That's funny...' (I say "alleged" because as the Quote Investigator points out in…