My first sales manager taught me to be paranoid. He constantly warned us that loose lips sink deals. After sales meetings and deal strategy sessions, he was always the last one in the room removing all of the paper evidence of our discussion, and even retrieving handouts that had been thrown into the trash. He took it all with him and shredded it back at our office.
He was vigilant with our sensitive data and I've carried those lessons with me throughout my career. You never know who might be listening in on your conversation at a hotel bar, on a train, or in flight. One misspoken word can easily get back to your competitor and torpedo your deal. That's how Murphy's Law works.