This Can No Longer Be Ignored - What is That You're Drinking?

For those, like me, wondering just what in the hell was so tasty/drunk-making about that blue drink Jake Gyllenhaal gets Robert Downey, Jr. hooked on in Zodiac, wonder no more:

Aqua Velva

3/4 oz. vodka
3/4 oz. gin
1/4 oz. Sprite
1/2 oz blue curaçao
1/2 oz. Sprite

Shake vodka, gin, blue curaçao and Sprite with ice. Pour/strain into glass and top off with more Sprite.

For those not so into the taste of vodka or gin, give it a bit to settle in. It's palatable stuff.

[Hat tip: Yahoo! Answers answerers.]