I think just once I had something approaching a hangover. My friend made me a cup of cheap, horrible coffee and he had this smelly electric heater which he insisted on aiming right at my head. And he smoked roll-ups. Holding onto the previous night's dodgy curry (which I was certain contained faeces) was a heroic feat. :-D
Interestingly, marijuana "hangover" (it's not really comparable, but it seems to last about as long) used to give me a weird warm feeling and a sense that while time was finally running linear again, I was living each moment a few seconds later. If that makes sense...
And James Stewart says "Hi!"