Grandma Saperstein and Grandpa Rabinowitz are sitting on the verandah of the old folks home rocking back and forth in their rocking chairs. Grandpa Rabinowitz rocks forward in his chair and says to Grandma, "Fuck you!"
Grandma Saperstein rocks forward in her chair and says to Grandpa, "Fuck you too!"
Grandpa becomes very much excited and shouts, "Fuck you!" swinging more forward again.
Grandma remains graceful but leans forward and says, "Fuck you again."
This goes on. Finally Grandpa says, "You know something, Grandma, this oral sex thing ain't all it's cracked up to be."