Hats off to Sakurai for the fantastic word play in this song. The words "cream soda" sound just like the words "kuruisou da" ("I'm gonna go crazy") that appear in the first line. And of course, the connotations and image of cream soda work very well with the theme of the rest of the song. I took some poetic liberties in this translation to try and accurately convey the slightly vulgar tone of the lyrics. Japanese doesn't really have an adjective like "fucking" (as in "fucking crazy"), but the word "kuruu" ("crazy") that Sakurai uses throughout the song is a very strong word that often comes across as rude in common speech, so I added in the vulgar English expressions to help express the right tone.