For me personally you can't beat a good pint of Snake Bite (heh, typical student drink) which is half lager, half cider and dash of blackcurrent cordial. It's like drinking fizzy alcoholic ribena!
However, if you can push the boat out, or are buying a special birthday drink, there's always the Jellybaby!
2 shots blue aftershock,
4 shots vodka,
1 can of redbull,
in a pint glass, with or without ice.
Tastes just like jelly babies, with a bit of a kick to them
Just be warned, bought one for a friends 21st on friday, good job it was her 21st coz it cost £20.60 at the club