Donna: Hold on a minute. That sign over there, it's in English. [disappointed] Are you having me on? Are we in Epcot?
Doctor: No-no-no, that's the TARDIS translation circuits. It just makes it look like English. Speech as well; you're talking Latin right now.
Donna: Seriously? I just said 'seriously' in Latin.
"The Fires of Pompeii", Doctor Who
Clara: How can I be a spy? I don't even speak Russian!
Soviet Officer: ...what?
Clara: I said...I... [to the Doctor] Am I speaking Russian right now?
Clara: Are they speaking Russian?
Doctor: Of course they are! They're Russians!
— "Cold War", Doctor Who
"When the Captain made a vague noise of appreciation in response to my breasts, the device scanned his mind, interpreted the context and psi-cast the equivalent meaning in Vulcan while simultaneously (using chronoton sideshift to avoid time-loss) refracting the light waves around his mouth so his lips appeared to be saying those words."