French 75s are a WWI era champagne cocktail and they are amazing. Two parts gin, one part each lemon juice and syrup, shake and strain into a flute, top up with the bubbly. Legend has it the name came from a WWI flying ace's declaration that it 'hits you like a French 75' - that being the slang for the Canon de 75 modèle 1897, a particuarly rapid-firing piece of Gallic artillery.

Fair warning, I'm a giant nerd about a lot of things, including booze. ;) Cheers! *clink*