So Agatha and Homer are sitting in their rocking chairs in the living room, just rocking.... rocking... rocking. Suddenly Agatha reaches over and whacks Homer with her cane. Dumps him on the floor.
Homer gets back into his rocker and resumes rocking... rocking... rocking...
By and by, he asks "What was that for?"
She tells him, "We've been married 54 years, and all this time, you've been a terrible lover."
They go back to rocking... rocking... rocking...
Suddenly Homer reaches over and whacks Agatha with *his* cane. Dumps her on the floor.
Agatha gets back into her rocker and resumes rocking... rocking... rocking...
By and by, she asks "What was that for?"
He says, "That's for knowing the difference."