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One critter notices that a cornered human has a gun. The other remarks "So what?'' and is promptly blown to bits. Followed by a (subtitled) Precision F-Strike as the first critter runs away.
Notable in that Siskel and Ebert apparently found it hilarious.
In the fourth movie, the surviving protagonists have to escape the ship before it explodes. The AI, which thus far has not demonstrated itself as being terribly competent, provides a helpful countdown, only to interrupt the countdown by replying to something said to it. When the computer resumes where it left off on the countdown, the ship promptly explodes with seconds left on the clock. Turns out, Talking is not a free action.