Hiding Behind the Language Barrier/Playing With

• Straight:Alice, Bob and Claire speak Language A, but Alice and Bob speak Language B to prevent Claire from understanding them.
• Averted: Alice and Bob can speak Language B, but choose not to because they don't want to act like they are keeping secrets from Claire.
• Subverted: Claire also knows Language B and understands the conversations that Alice and Bob wanted to keep secret from her
  • Double Subverted: Claire doesn't know Language B well enough to fully understand the conversation.
• Lampshaded: "We can't let Claire find out about this, Bob." "It's a good thing she doesn't know Language B, Alice!"

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I'm sure the people talking in that language I don't know are discussing Hiding Behind the Language Barrier