Faced with a almost-certain deathly experience, what do you do?

Example: You're in a plane. Engines cut out. Plane starts plummeting. Nothing you can do but wait until the inevitable. What do you do?

Freak out? Kiss the nearest stranger? Watch your life flash before your eyes? Kill a man just because you've subconsciously always wanted to but social norms and a prison sentence have prevented you from doing this... until now? (That escalated quickly.)

Simply, how do you think you'd react if you had time (say, a minute) to reflect before dying instantly?