He walked into the office one morning after a meeting at a local bar with a client. He had a big grin on his face and handed me a cocktail napkin. It had a sales agreement signed by a client that was for a million dollars worth of product.
I did that once. Came back from conference in Berlin with an agreement solely based on a handshake. We did the business requested by the client, they paid us the agreed fee and a bonus (which was not part of the original agreement) and everyone was happy. We did the same thing again, and again got a payment with bonus.
Then legal got involved. They insisted that we have a formal agreement in place with the client. Ten pages of dense legalese later everything was signed. The client took me out to lunch and told me that we couldn't do another deal, the lawyers had squeezed the life out of the whole point of dealing with us in the first place.