Shots. I had a cranberry and vodka for my first legal drink, then I had a beer.
Of course, I got so trashed that I couldn't lift my head a week earlier off of grape KoolAid (lots of sugar added), strawberry juice and Everclear. It was really sweet and you couldn't taste any of the alcohol. It might have been the 1/2 bottle of RumbleMinz that did me in beforehand though... heh heh. Good times.