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This system relies on the principle that most aliens have a distinctive language or accent which they speak in. To prevent hostile aliens from using the ship in an unauthorized fashion, and to delay them if they try, this system leads them on a wild goose chase. For example, here's a conversation between a hostile Romulan and the accent recognition annoyance program:
Romulan: Change heading to 182 mark 325 and engage at warp 9!
Computer: This will take you on a direct route into hostile territory. Are you sure you want to do this?
Romulan: Yes.
Computer: Are you REALLY sure you want to do this?
Romulan: Yes.
Computer: Are you POSITIVE you want to do this?
Romulan: Yes!
Computer: Are you ABSOLUTELY *POSITIVE* this is the right thing to do?
Romulan: YES!
Computer: Are you ABSOLUTELY, POSITIVELY SURE that you want to--
Romulan: YES! Stop asking me!
Computer: I don't think using that heading is a good idea.
Romulan: I don't care! Just do it!
Computer: I'm sorry, my programming forces me to ask for a security authorization to confirm that course and heading. Do you know the security code? . . . .
. . . and so on . . .
~Jeremy Lennert, Simon Dark of the 7th Fleet