One day, while at TWO, I was looking at some of the interesting stuff all over the walls, I asked a long time TWO regular about a T shirt on the wall. This is the story he told me. I can't verify its accuracy but it sure sounds like Frank.
Someone had trailered his bike to TWO with his car and rented one of the upstairs rooms in the lodge. The next day he went off for a ride, and left his car parked in front of the split rail fence right in front of the lodge. This was designated MOTORCYCLE PARKING ONLY. I took a pic (sorry no car) showing the fence and sign.
When Frank saw the car there, he was furious. The owner of the car was out riding all day, giving Frank plenty of time to work up his anger. When the man finally returned, Frank was waiting for him and let him have it. Finally he said:
"YOU HAVE FAILED AS A CUSTOMER!!! GET OUT!!!" And Frank did make him get out.