Alice, Bob and Claire all speak Language A, which is usually the language the work is written in or translated into, and may be the "common" language of the world. But Alice and Bob also speak Language B, which may be their native language, while Claire does not, enabling them to have private conversations if Claire is in earshot or they know Claire is eavesdropping. This trope can also be used to keep information from the audience, depending on whether a translation is provided. If the language is real and not translated, it can be a Bilingual Bonus. Examples