Eminem vs. Machine Gun Kelly — Killshot

MGK tweeted that Eminem's daughter was "hot" in 2012. Six years later, Em released "Not Alike" (a subliminal diss) on Kamikaze. MGK responded with "Rap Devil" (300 million YouTube views). Eminem dropped "Killshot" — 38 million views in 24 hours, the fastest hip-hop debut in YouTube history at the time. Total combined views: 1.5 billion+. MGK subsequently pivoted his entire career to pop-punk, which many interpreted as admission that he couldn't survive in Eminem's lane. One diss track literally made a man change genres. That's the most devastating outcome in rap beef history.