BabySmurfette:
IRN-Bru really is the best hangover cure!
I second this. However, if you drink it WHILST you are out on the lash, it can go one step better and prevent a hangover!
JaegerBru (Jaegermeister and Irn-Bru) was invented my me at a house party, and has never failed to prevent me from being sick/having a massive headache the morning after!