About:

 Staying calm

2 stories come to mind.

The first: Being held at gun point on the Indonesian island of Sumbawa by mercenaries armed to the teeth for about 30 minutes, one of two tourists on a minibus of approximately 30 locals. Resisting the urge to stick my camera out the window. Absolutely nothing we could do about it.

Lesson learned: there are places which are said to be safe for travel but one should always be ready for the opposite. 

The second story, 37,000ft off the coast of Lebanon in a rented McDonald Douglas MD80 and one engine is shut down because of a catastrophic engine failure due to a serious engine surge. The plane is brought under control by the auto pilot and our Greek nameless pilot (he did give his name but to be honest it was the last thing on my mind to remember it) made an emergency landing (like a boss) at a different airport to which we had taken off from.  

Again nothing I could do about it.

Lesson learned: don't partake in hired planes which have been sitting on the tarmac for 6 months without any activity (we found this out later by running the tail number. Make sure you thank the Captain next time when safely back on the ground!