I work for a Very Large Software company and was stuck, one day many years ago, in the middle exit row seat between two guys who obviously worked together. I offered to move to the aisle or window but they didn't want to move. And they spend the whole flight talking across my head.

I realized five minutes into the ride that they worked for our Major Competitor and that they were discussing a Major Deal where they had inside information that our sales guys had missed.

I put on my headphones (no music) and took notes on my laptop as they detailed their entire strategy and their insider information.

When we got up I got another pax between us and, as I was preparing to go down the aisle I said: "I work for Very Large and know the sales manager on Major Deal - I'll be sure to send him these notes tonight."

Then I skedaddled.