Today's xkcd cartoon, a features list for bird/plane/Superman, is one of the funniest I've seen lately. It also rings something in my head that I can't identify. I hear in my head a voice - and it's without visuals, so this isn't a movie/tv show, nor a book, but either radio or a record - saying:
"It's a bird! It's a plane! *yccch* It's a bird."
I hear it distinctly, but I'm drawing a blank on remembering where it's from.
Probably it'll hit me the next time I hear whatever it is.
This has happened to me twice before with lines that popped into my head. In each case I did not, at the time, own a copy of the source, so it was years before I happened to see/read that source again (one was a book, one a movie), and I suddenly remembered: ah, that's where that comes from.
"We are the chorus, and we agree. We agree, we agree, we agree."
which is from the parody of Galadriel's lament in Bored of the Rings, and the other is:
"Who are you who are so wise in the ways of science?"
which is spoken by Bedevere to King Arthur in Monty Python and the Holy Grail after a little experiment involving a witch and a duck.