Simple really. Go out, have some rum, some wine, mussels, seabream, crushed potoato (wanky restuarant, it was mash) Bailey's coffee, walk, meet friends, more rum and -somewhat inexplicably-two pints of carlsberg. Get cab home, drink water, feel funny, go to bathroom and vomit compiously. Now not a mini vom either, a full force gale spray of a puke. See mussels again. Wave at them if you wish.
And voila, no hangover the next day. Nada, zip, feeling positively dandy. About to go for a scamper in the park.
Huzzahs all round then!
Alcohol in, alcohol out.
It astounds me how often I come up with simple and effective remedies to day to day problems.