Grandma, how long have you and Grandpa been married ?

[Bad Karma]

"Grandma, how long have you and Grandpa been married?" asked young Nina.
"Fifty years," Grandma replied.
"That is so wonderful," exclaimed Nina. "And I bet in all that time, you never once thought about divorce, right?"
"Right Nina. Divorce, NEVER. Murder, lots of times, but never divorce."