Just come back after a fight everyday for 30 years.
Watched one of the episodes in Grey's Anatomy movie. An elderly couple was still bickering with each other even though the husband was pierced with a pole when storm hit Seattle. Apparently both of them fight almost everyday for 30 years, the wife told the doctor that they could have not survive the marriage without the quarreling. "Most importantly, he comes back after every fight and I always love him for that."