Pleased to meet you, Frodo... Reppuli?

[Legate of Amon Lanc]

Today I just accidentally came upon one thing in the Hobbit while reading the English original. While reading Gollum's riddle about "time" I was interested how it sounds in original; for I knew there was a sort of linguistic joke in there. What was my surprise when I realized that the sentence (or part of it, to be precise) is completely missing in the original! After a moment of thinking about it, however, I came to the conclusion that it's not that surprising after all. Translators often have to deal with untranslateable passages and have to translate them differently. Nevertheless, it's interesting: the Czech translator has made up one more sentence, which was not included in the original at all.

I immediately thought if there could be similar moments in any of the other translations; and if anyone knows about it. If I were sure there would be some positive answers, I'd make a new thread about that, but since I'm not sure if it is not unique case, I'll include it for now just in this post.

The "extra sentence" comes right after the riddle. I'm not sure if the joke would be explainable, but I will try, just in case anyone is interested.

In the original, we read:

"This thing all things devours:
Birds, beasts, trees, flowers;
Gnaws iron, bites steel;
Grinds hard stones to meal;
Slays king, ruins town,
And beats high mountain down."
Poor Bilbo sat in the dark thinking of all the horrible names of all the giants and ogres he had ever heard told of in tales, but not one of them had done all these things.

The Czech translation plays with the spelling. In the translation, Gollum is always lisping. That is not shown by any "sss" as in the original, but by changing the consonant "s" to "š" (pronounced [sh] as in "short"). That created an interesting situation for the translator.
The words "Slays king" are translated as "Krále školí" - if Gollum spoke normally, it would be "krále skolí". "Král" means "King". "Skolí" means "slays". "Školí" (derived from the word "škola" = school) means "teaches".
The translator probably had to make it clear that Time does not teach kings (though it does as well), but slays them. Thus, he expanded the sentence: "Though poor Bilbo understood that lisping Gollum meant "slays king", and not some teaching, he still could not remember that any of the giants and ogres he had ever heard told of in tales had done all these things..."

It's a little thing, but interesting, nevertheless. I am not much sure if it's funny the other way around. Probably not at all. But perhaps someone could provide us with another, (more) interesting "play with words" he knows from his translation?