For me, it was definitely when Eminem and Elton John performed together at the Grammys. (Psst, we want YOU to submit your question ideas to BuzzFeed! Fill out this <a href="https://docs.google.com/forms/d/e/1FAIpQLSfq_OgLBeXPXhP-TW7Li3kUx_rzu8WngQxhFeSqWVndMLPclQ/viewform?usp=dialog" target="_blank">form</a>, and we might just pick yours! 👀)