Star Trek III: The Search For Spock
'Stealing the Enterprise'
I was too young to see this the first time around, but it's now one of my fave scenes!
Desperate to save the life of his friend, Captain Kirk asks permission to take the Enterprise on a rescue mission. When the answer 'No' is given, he decides to take it anyway.
My fave line in this scene?
McCoy - 'Are you just gonna WALK through?!'
Kirk - 'Calm yourself Doctor'