This was exactly the purpose of this sentence. Bravo for discovering it :)
I read that Batman used to be called Lynvingen in Norwegian. Lyn means 'lightning', right?
If you also know some german you will recognize this from Fledermaus, as it's taken directly from the german, which itself can trace roots to the Old High German fledermüs
Wiktionary also lists a VERY interesting slang usage of this word, but I'll let you discover that adorable gem for yourself. Actually it makes this sentence even more horrifying.
OMG- I looked up the word in wiktionary- NOT what I was expecting! Indeed horrifying...
In which language is this fact? Didn't see anything in either Bokmål or German, and the German page says the Old High German word is fledarmūs.