1. Needing a word in one language but only being able to think of it in the other.
2. Accidentally speaking the wrong language.
3. Having to speak in one language after you haven't used it in ages.
4. "Ooooh! Say something in [insert language here]!!!"
5. "OMG! Teach me [insert language here]!"
6. "Will you pleeeease do my [insert language here] homework? Since you're an expert and all."
7. Being the automatic translator whenever anything in your language is present: people, films, books, the translations of nutrition facts on food labels, etc...
8. Having people assume that, since you know one foreign language, you can therefore help them with any given language, no matter what it is.
9. Accidentally changing language mid-sentence.
10. Autcorrect. Just, autocorrect.

