Ooooh... it depends on my mood.
Usually (well usually I drink tea, but besides that), lots of milk and a small amount of sugar. But then there's also lots of sugar with little milk, lots of both, or if I really am in the mood none of both, a really strong espresso brewed for about 10 minutes which blows your head off (or at least makes you go crosseyed and your jaw lock up for half a second) it's a masochistic pleasure..
Then there's something fun to do in the summer or on a hot day: make a normal coffee but add a lot of sugar and milk as well as a small amount of vanilla, then let it cool in the fridge and serve it in a glass with an ice cube in it (or even some icecream) and a straw or two.