@spikepipsqueak,
(A) Film I haven't seen, Ruthless People, but one of my all-time favorite depictions of a married couple are Rhea Perlman and Danny DeVito portraying the mother and father in 'Matilda' (a film adaptation of a Roald Dahl book for children).
I used to watch it over and over and just laugh and laugh ; I'd recommend it if you haven't seen it.