JoeReal

On an trip from Washington, DC to Texas, two doctors and a lawyer happen to seat together in one row on a fully booked flight. One doctor was seated by the window, another doctor in the middle seat and the lawyer seated next to the aisle.

After the plane reached the cruising altitude, the lawyer took off his shoes and made himself comfortable at his seat. It was a long wait for the snacks and drinks to come, so the doctor by the window, excused himself to get some soda, but before he could move, the lawyer by the aisle courteously volunteered to get the soda. "Why, thank you!" said the doctor. While the lawyer was away, the doctor by the window grabbed one of the lawyer's shoes and spat on it, then put it back. A minute after the doctor by the window sipped his soda, the doctor in the middle excused himself to get soda, and the lawyer courteously volunteered to get the soda for him also. While the lawyer was away, he took the other shoe and spat on it and put it back to where it was.

The sodas were delivered and then consumed, and long after, the pilot announced for everyone to prepare for landing. The lawyer then put on his shoes and realizing what the two doctors have done he told them "When will this animousity between our professions ever stop? The malpractice lawsuits, the spitting on the shoes, and the peeing on soda cans...."