Fan Casting Bilingual Dialogue in Sort by Tropes

For whatever reason, two or more characters can't speak the others' language in anything better than heavily mangled, imprecise gobbledygook. However, all involved can understand the others' language when spoken. This results in unnervingly cool, creepy, or cantankerous scenes depending on the set-up, as you have two people listening and responding to each other in completely different languages, creating a Bilingual Dialogue (and sometimes acting as interpreters to any third parties present).