I completely forgot about that exchange. I was about 90% sure that link was going to be a clip of Superman: The Animated Series when Clark first encounters Mr. Mxyzptlk. I can't find it on YouTube, but it goes like this:
Mr. Mxyzptlk: You, my friend, are the ultimate challenge! We're going to have very merry games, you and I!
Superman: A game has rules! Your stunts are just random idiocy!
Mr. Mxyzptlk: Okay, I'll give you a rule! If you can make me say, spell or otherwise reveal my name backwards and I'll split, until our dimensions come into alignment again in... oh, three months, give or take.
Superman: I can't even say your name forwards - how am I supposed to say it backwards?
Mr. Mxyzptlk: No, dope, you don't have to say it, you have to get me to say it!
Superman: Say what?
Mr. Mxyzptlk: Kltpzyxm! Gosh, you're thick! Now, for the last time... ah, nuts!
Mr. Mxyzptlk: You, my friend, are the ultimate challenge! We're going to have very merry games, you and I!
Superman: A game has rules! Your stunts are just random idiocy!
Mr. Mxyzptlk: Okay, I'll give you a rule! If you can make me say, spell or otherwise reveal my name backwards and I'll split, until our dimensions come into alignment again in... oh, three months, give or take.
Superman: I can't even say your name forwards - how am I supposed to say it backwards?
Mr. Mxyzptlk: No, dope, you don't have to say it, you have to get me to say it!
Superman: Say what?
Mr. Mxyzptlk: Kltpzyxm! Gosh, you're thick! Now, for the last time... ah, nuts!