Language students and multilinguists: most untranslatable?

[cestpaspossible]

Poll question: Language students and multilinguists: most untranslatable?

[Stirk]

1. As a fan of language, I'd love to hear some explanations or examples.

I would expect curses to be easily translatable. Not so?

[bicentennial_baby]

2. As an ESL tutor and a language student

I'd have to go with cultural idioms, by far.

[noamnety]

3. I'd go with puns

because they tend to rely on a word/homophone that can have two different definitions in one language, but not the other.