Jay-Z "It's Hot (Some Like It Hot)" (1999)
LYRIC: "Go against Jigga, yo' ass is dense/I'm about a dollar, what the fuck is 50 Cents?"
TARGET: 50 CENT
SHOTS FIRED? 50 name-dropped Jay-Z on "How To Rob," so Jay hit him with half a bar. Thus, a long frenemy-ship was born.