2. Also an awesome song that's the opening theme to Gantz.
2. (Words to the song) Kimi wa (DO-DO-DO-DOPAMINE!) doko yara? sagashi ni kite,?AWHEREVER YOU ARE
soshite FLY AWAY (A ARARARA A A YEAH!)
as explained in charlieissocoolike's video "Chemical Love"
it makes you infatuated with somebody.
it is also the chemical that makes you sort of high and happy.
DUDE 2: "no you don't, you've only known her for like a week."
DUDE 1: "but she's perfect"
DUDE 2: "that's the dopamine talking!"