As they were seated behind me, I never did get an opportunity to clearly see the two participants of this exchange. Even the mental picture that my mind manufactured to fill in the blanks never became more than vague. One was undoubtedly on the heavy side, as the first stage -- or, at least, the stage that first came to my attention -- of the conversational loop was clear to indicate:

"Well, you're just a lard ass."

"So?"

"Well, and my mom says that it's because you do nothing but sit around and eat hamburgers all day, and that's why you have such a fat ass."

"So? That's her opinion."

"And you never do anything, and you eat two happy meals at once, and just get fatter and fatter."

"So what? Just because she says that doesn't make it true."

"I know."

It was strange enough to hear this coming from two fully-grown men, but it was about to get a good deal stranger. The debate over poor dietary habits was immediately interrupted as we approached the next bus stop: the one who had been making the critique adopted a shrill falsetto, while the hamburger glutton replied in an emphatic, but natural, tone of voice.

"Get off here! Get off here!"

"No Satan, I won't!"

"Get off! Get off!!"

"Shut up Satan! You can't make me!"

"Shut up yourself! Get off here!"

"You shut up Satan!!"

"Shut up!! Shut up!!"

This was followed by a short period of silence. Apparently, as a last defense against the devil's impure urgings, his righteous victim had resorted to physical means.

"I'm sorry I put my hand over your mouth."

"That's okay."

Another brief silence passed before the first phase of the conversation was resumed. The whole pattern was repeated at least three times during the duration of my bus ride.

On the only other occasion that I encountered this unusual pair (and once again on the same bus route) they were accompanied by a third individual who aggressively denounced them, as well as anyone else who passed within range, as hopeless sinners. The original duo made intermittent, feeble attempts to defend their righteousness; but the third always squashed these efforts with savage and hopelessly convoluted biblical quotes ("Do you know how many angels can land on the head of a pin? A HUNDRED THOUSAND ANGELS can land on the head of a pin, but still you will not abandon your sinful ways.") Just as I was about to disembark, I heard him loudly declaim to no one in particular:

"Pick up your cross for Jesus -- ASSHOLE."
M3(7)