In eighth grade I used adamantium (fictional indestructible alloy that covers Wolverine's bones/claws) in a report on metals for science class. I knew Wolverine and the comics were fictional but I assumed adamantium was real. I remember that I tried researching it (very very early Internet days, I mostly used the library) but couldn't find anything on the subject. For some reason, I decided to keep my comments on adamantium in my paper regardless and without citation. My Science teacher circled the word and wrote "EXCELLENT!!!" next to it so I didn't figure out my folly until years later. I think he assumed I was joking?
Reminds me of my sixth grade teacher discussing FTL travel with me. I commented about how you would be "thrown backwards" (as in, with speed, like when a car accelerates). He interpreted that as me observing the 'time travel' properties of FTL, which made me sound a lot smarter than I actually was.
