You may have heard that some of the biggest pop hits of the 90's were also secretly about addictive drug Crystal Meth. We rounded up some of the most shocking examples. Probably best known as the biggest hit most people don't realize is about Crystal Meth, singer Stephan Jenkins name-checks the drug in a quickly mumbled verse leading to many awkward pauses when karaoke singers read the lyrics for the first time. The "Candy" in the title and lyrics of this song in-fact is referring to how Crystal Meth can resemble rock candy. The "Groove" of Groove is in the Heart is a big, fat rock of Crank, while the "Heart" is a soda can repurposed as a pipe. More importantly, the slide whistle represents the rush of the high and intense comedown.