Espresso, lots of sugar. Only occasionally as it drives me nuts, or if I'm really hungover. Essential after a night on the sauce before teaching English to unmoved French kids back in the day, when I'd be gray of face and shaking of hands before shot of dark magic...
Tu me trouverais toujours au zinc du bar Pasteur dans la quinzieme... la gueule de bois.
If you're ever looking for a decent cup around Waterloo in London, head to Scooterworks on Lower Marsh. Charlie will make you up a decent macciato and they make the best italian hot chocoklate too (so thick you need a spoon). He'll also try to seel you a pink 1971 Vespa. And why not?