[tangaloomababe]

Love this one from Orbit:
I think it shows the pratical but evil side of Orac!
AVON: What's the position now, Orac?
ORAC: Remaining flight time: five minutes and forty seconds.
AVON: How much more weight must we lose before we can achieve escape velocity?
ORAC: Seventy kilos, Avon.
AVON: Only seventy kilos... Vila, strip off the insulation material in the cargo hold. [Vila turns.] Vila! [Avon takes some small object from a panel and hands it to him.]
VILA: But that's plastic. It weighs nothing.
AVON: Get rid of it anyway.
VILA: A kilo and a half if we're lucky.
AVON: Do it! We've got five minutes. [Vila turns and heads out.] Not enough! Not nearly enough! Dammit, what weighs seventy kilos?
[The door can be heard opening.] ORAC: Vila weighs seventy-three kilos, Avon.