Puget Sound was a great place to study higher mathematics. You got on the Kalakla and went to the food service area on the upper deck at the back, and ordered a cup of coffee. You could spend the whole 55 minute trip to or from Bremerton watching the Bessel functions form on the surface of the coffee. Every 5 seconds of so a peak would rise up in the middle of the cup and a drop of coffee would shoot up into the air. However, on stormy nights or when the ferry went through a log boom (why didn't they require lights on those things?), you just drank your coffee fast, or it was slopped all over the counter.