In 16.5 years, I have learnt:
(a) never to offer to drive anywhere, ever, unless dh is too pissed to comment;
(b) to keep knives, forks and spoons separate in the cutlery container of the dishwasher [anal dh emoticon];
(c) to sleep through snoring at 900 decibels;
(d) not to correct his Italian - it's not beautiful, but it's effective, and correcting him is just rude (as is laughing - laughing is only allowed when he inadvertently mixes up the words for 'bunny rabbit' and 'bollocks');
(e) that rude comments re. excessive facial hair are likely to result in a 6-month shaving strike;
(f) that, despite neither of us being particularly blessed in the looks department, somehow our genes combine to produce stunningly gorgeous offspring;
(g) that whatever happens, the things we share are much more important than the things that divide us (see above, re. comments on driving, dishwasher-related anal-ism, excess facial hair, bad Italian and snoring), and that's why we're still happy!